VASSILEV Stanislav

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Professor, DSc, PhD

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Acad. G. Bonchev Str., Bl. 107 Sofia 1113 Bulgaria

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CURRICULUM VITAE

Place of birth: Sofia, Bulgaria

Year of birth: 1959

Nationality: Bulgarian

EDUCATION AND SCIENTIFIC DEGREES:

  • MSc (1979-1984) in Geology-Geochemistry (Petrology-Lithology Department, Geology-Geographic Faculty) at Sofia University;
  • PhD (1991) at Institute of Applied Mineralogy (at present InstituteofMineralogyandCrystallography), Bulgarian Academy of Sciences
  • DSc (2005) at Central Laboratory of Mineralogy and Crystallography(at present InstituteofMineralogyandCrystallography), Bulgarian Academy of Sciences

FIELD OF RESEARCH:coal; biomass; municipal solid waste; petroleum coke; geology, mineralogy, geochemistry and ecology; solid waste products; fly ashes; chars; refuse-derived fuels; new building materials; catalysts; sorbents; combustion; pyrolysis; gasification; thermoelectric power stations; trace elements; environmental protection 

FELLOWSHIPS, SPECIALIZATIONSAND AWARDS:

  • Postdoctoral Fellowship Award of the "Science and Technology Agency" of Japan at Hokkaido National Industrial Research Institute, Sapporo, Japan (02.1993-08.1994);
  • Postdoctoral Fellowship Award "Research in Brussels" of Belgium at Free University of Brussels, Belgium (01.1997-11.1997);
  • Visiting European Community scientist at Free University of Brussels, Belgium (12.1997-12.1998);
  • Postdoctoral Fellowship Award of the "Ministry of Education and Culture" of Spain at National Institute of Coal, Oviedo, Spain (06.2000-11.2001);
  • NATO Collaborative Linkage Grant between Bulgaria, Spainand Turkey (2002-2004), with 1-month specialization at Hacettepe University, Ankara (Turkey);
  • Detached National Expert at European Commission, Institute for Energy and Transport, Joint Research Centre, Petten, The Netherlands (11.2007 - 11.2013);
  • The best publication of theInstitute for Energy and Transport for 2010, Joint Research Centre, European Commission

PROFESSIONAL EXPERIENCE:

  • Research Professor, InstituteofMineralogyandCrystallography(2007-present);
  • Scientific Secretary, Central Laboratory of Mineralogy and Crystallography (1995-1997 and 1998-1999);
  • Research Associate Professor, Central Laboratory of Mineralogy and Crystallography  (1995-2007);
  • Research Associate, Central Laboratory of Mineralogy and Crystallography, Institute of Applied Mineralogy (1987-1995);
  • Researcher, Institute of Applied Mineralogy (1984-1987)

MAJOR PROJECTS:

  • Mineralogy, geochemistry and advanced sustainable application of solid fuels and their waste products from thermal conversion (Bulgaria);
  • Influence of mineral and chemical composition of coal ashes on their fusibility (Japan);
  • Study of the behaviour of toxic metal traces in wastes derived fuels (Belgium);
  • Low cost catalytic sorbents for NOx reduction based on coal chars doped with transition metals (Belgium, ECSC 7220-EC-042);
  • Chemical and phase-mineral characterization of combustion wastes from some Spanish coal-fired power stations as a basis for their advanced utilization (Spain);
  • Environmental implications of power plant feed coal and ash geochemistry (Bulgaria, Spain, Turkey, NATO-EST.CLG.979151);
  • Composition, properties and advanced sustainable application of biomass and biomass ash (European Commission, The Netherlands)

SCIENTIFIC CONTRIBUTION:

  • H-index in Scopus - 27 (based on 50 publications in Scopus);
  • Publications - 90, as most of them in international peer-review journals with impact factor;
  • Conference reports and posters - 27(Bulgaria, China, Colombia, Denmark, France, Germany, Hungary, Japan, Poland, Romania, Spain, USA);
  • Teaching and invited lectures (Bulgaria, Belgium, Japan, Spain, The Netherlands, Turkey);
  • Project reports - 22;
  • Citations - >2500

MEMBERSHIPS:

  • Editorial Board of the "Elsevier" journal "FUEL" (since 2005);
  • Editorial Board of the "Allen Press" journal "Coal Combustion and Gasification Products" (since 2008);
  • Editorial Board of the "Springer" journal "Waste and Biomass Valorization" (since 2009);
  • Committee for Coal and Steel (COSCO) at European Commission (2007-2008);
  • Specialized Scientific Council of Geological Sciences at the Highest Testimonial Commission at the Council of Ministers of the Republic of Bulgaria (2007-2011);
  • Bulgarian Geological Society;
  • Bulgarian Mineralogical Society;
  • Federation of Scientific and Technical Unions in Bulgaria

SELECTED PUBLICATIONS:

1.Vassilev, S., Vassileva, C., Vassilev, V., 2015. Advantages and disadvantages of composition and properties of biomass in comparison with coal: An overview. Fuel, 158: 330-350.

2. Morgan, T.J., George, A., Boulamanti, A.K., Alvarez, P., Adanouj, I., Dean, C.,Vassilev, S.V.,Baxter, D., Andersen, L.K. 2015. Quantitative X-ray fluorescence analysis of biomass (switchgrass, corn stover, eucalyptus, beech, and pine wood) with a typical commercial multi-element method on a WD-XRF spectrometer. Energy and Fuels, 29 (3): 1669-1685.

3. Vassilev, S., Baxter, D., Vassileva, C., 2014. Trace element concentrations and associations in some biomass ashes. Fuel, 129: 292-313.

4. Vassilev, S., Baxter, D., Vassileva, C., 2014. An overview of the behaviour of biomass during combustion: Part II. Ash fusion and ash formation mechanisms of biomass types. Fuel, 117: 152-183.

5. Andersen, L.K., Morgan, T.J., Boulamanti, A.K., Alvarez, P., Vassilev, S.V., Baxter, D., 2013. Quantitative X-ray fluorescence analysis of biomass: Objective evaluation of a typical commercial multi-element method on a WD-XRF spectrometer. Energy and Fuels, 27 (12): 7439-7454.

6. Vassilev, S., Baxter, D., Vassileva, C., 2013. An overview of the behaviour of biomass during combustion: Part I. Phase-mineral transformations of organic and inorganic matter. Fuel, 112: 391-449.

7. Vassilev, S., Baxter, D., Andersen, L., Vassileva, C. 2013. An overview of the composition and application of biomass ash. Part 2. Potential utilization, technological and ecological advantages and challenges. Fuel, 105: 19-39.

8. Vassilev, S., Baxter, D., Andersen, L., Vassileva, C. 2013. An overview of the composition and application of biomass ash. Part 1. Phase-mineral and chemical composition and classification. Fuel, 105: 40-76.

9. Vassilev, S., Baxter, D., Andersen, L., Vassileva, C., Morgan, T. 2012. An overview of the organic and inorganic phase composition of biomass. Fuel, 94: 1-33.

10. Kostova, I., Hower, J., Mastalerz, M., Vassilev, S. 2011. Mercury capture by selected Bulgarian fly ashes: Influence of coal rank and fly ash carbon pore structure on capture efficiency. Applied Geochemistry, 26: 18-27.

11. Vassilev, S., Baxter, D., Andersen, L., Vassileva, C. 2010. An overview of the chemical composition of biomass. Fuel, 89: 913-933.

12. Vassilev, S., Vassileva, C., Baxter, D., Andersen, L. 2009. A new approach for the combined chemical and mineral classification of the inorganic matter in coal. 2. Potential applications of the classification systems. Fuel, 88: 246-254.

13. Vassilev, S., Vassileva, C. 2009. A new approach for the combined chemical and mineral classification of the inorganic matter in coal. 1. Chemical and mineral classification systems. Fuel, 88: 235-245.

14. Liu, G., Qi, C.,Vassilev, S.,Chen,Y. 2007. Mineral and chemical composition of Yanzhou coal and coal ash (China), with volatilization behaviour to 1000°C.  Journal of the Energy Institute, 80 (4): 199-203.

15.Vassilev, S., Vassileva, C. 2007.A new approach for the classification of coal fly ashes based on their origin, composition, properties, and behaviour. Fuel, 86: 1490-1512.

16. Vassileva, C., Vassilev, S. 2006.Behaviour of inorganic matter during heating of Bulgarian coals. 2. Subbituminous and bituminous coals. Fuel Processing Technology, 87: 1095-1116.

17. Karayigit, A., Bulut, Y., Karayigit, G., Querol, X., Alastuey, A., Vassilev, S., Vassileva, C. 2006. Mass balance of major and trace elements in a coal-fired power plant.Energy Sources, 28: 1311-1320.

18. Karayigit, A., Bulut, Y., Querol, X., Alastuey, A., Vassilev, S. 2005. Variations in fly ash composition from the Soma power plant, Turkey. Energy Sources, 27: 1473-1481.

19. Vassileva, C., Vassilev, S. 2005. Behaviour of inorganic matter during heating of Bulgarian coals. 1. Lignites. Fuel Processing Technology, 86: 1297-1333.

20. Vassilev, S., Vassileva, C. 2005. Methods for characterization of composition of fly ashes from coal-fired power stations: a critical overview. Energy and Fuels, 19: 1084-1098.

21. Liu, G., Vassilev, S., Gao, L., Zheng, L., Peng, Z. 2005. Mineral and chemical composition and some trace element contents in coals and coal ashes from Huaibei coal field, China. Energy Conversion and Management, 46: 2001-2009.

22.Vassilev, S., Menendez,R. 2005. Phase-mineral and chemical composition of coal fly ashes as a basis for their multicomponent utilization. 4. Characterization of heavy concentrates and improved fly ash residues. Fuel, 84: 973-991.

23. Vassilev, S., Vassileva, C., Karayigit, A., Bulut, Y., Alastuey,A., Querol, X. 2005. Phase-mineral and chemical composition of fractions separated from composite fly ashes at the Soma power station, Turkey. International Journal of Coal Geology, 61: 65-85.

24. Vassilev, S.,Vassileva, C., Karayigit, A., Bulut, Y.,Alastuey, A.,Querol,X. 2005. Phase-mineralandchemicalcompositionofcompositesamplesfromfeedcoals, bottomashesandflyashesattheSomapowerstation, Turkey. International Journal of Coal Geology, 61: 35-63.

25.Vassilev, S., Menendez, R., Borrego, A., Diaz-Somoano, M., Martinez-Tarazona, M.R. 2004. Phase-mineral and chemical composition of coal fly ashes as a basis for their multicomponent fly ash utilization. 3. Characterization of magnetic and char concentrates. Fuel, 83: 1563-1583.

26. Lazaro, M.J., Galvez, M., Suelves, I., Moliner, R., Vassilev, S., Braekman-Danheux, C. 2004. Low cost catalytic sorbents for NOx reduction. 3. NO reduction tests using NH3 as reducing agent. Fuel, 83: 875-884.

27.Vassilev, S., Menendez, R., Diaz-Somoano, M., Martinez-Tarazona, M.R. 2004. Phase-mineral and chemical composition of coal fly ashes as a basis for their multicomponent utilization. 2. Characterization of ceramic cenosphere and water-soluble salt concentrates. Fuel, 83: 585-603.

28.Vassilev, S.,Menendez, R., Alvarez, D., Diaz-Somoano, M., Martinez-Tarazona, M.R. 2003. Phase-mineral and chemical composition of coal fly ashes as a basis for their multicomponent utilization. 1. Characterization of feed coals and fly ashes. Fuel, 82: 1793-1811.

29. Lazaro, M.J., Suelves, I., Moliner, R., Vassilev,S., Braekman-Danheux, C. 2003. Low cost catalytic sorbents for NOx reduction. 2. Tests with no reduction reactives. Fuel, 82: 771-782.

30. Vassilev, S., Tascon, J. 2003. Methods for characterization of inorganic and mineral matter in coal: a critical overview. Energy and Fuels, 17: 271-281.

31. Vassilev, S,Braekman-Danheux, C., Moliner, R., Suelves, I.,Lazaro, M.J.,Thiemann,T. 2002. LowcostcatalyticsorbentsforNOxreduction. 1. Preparationandcharacterizationofcoalcharimpregnatedwithmodelvanadiumcomponents and petroleum coke ash. Fuel, 81: 1281-1296.

32. Vassilev, S., Eskenazy, G., Vassileva, C. 2001. Behaviour of elements and minerals during preparation and combustion of the Pernik coal, Bulgaria. Fuel Processing Technology, 72: 103-129.

33. Vassilev, S., Eskenazy, G., Vassileva, C. 2000. Contents, modes of occurrence and behaviour of chlorine and bromine in combustion wastes from coal-fired power stations. Fuel, 79: 923-937.

34. Vassilev, S., Eskenazy, G., Vassileva, C. 2000. Contents, modes of occurrence and origin of chlorine and bromine in coal. Fuel, 79: 903-921.

35. Vassilev, S., Braekman-Danheux, C., Laurent, P., Thiemann, T., Fontana, A. 1999. Behaviour, capture and inertization of some trace elements during combustion of refuse-derived char from municipal solid waste. Fuel, 78: 1131-1145.

36. Vassilev, S., Braekman-Danheux, C. 1999. Characterization of refuse-derived char from municipal solid waste.  2. Occurrence, abundance and source of trace elements. Fuel Processing Technology, 59: 135-161.

37. Vassilev, S., Braekman-Danheux, C., Laurent, P. 1999. Characterization of refuse-derived char from municipal solid waste.  1. Phase-mineral and chemical composition. Fuel Processing Technology, 59: 95-134.

38. Vassilev, S., Vassileva, C. 1998. Comparative chemical and mineral characterization of some Bulgarian coals. Fuel Processing Technology, 55: 55-69.

39. Vassilev, S., Vassileva, C. 1997. Geochemistry of coals, coal ashes and combustion wastes from coal-fired power stations. Fuel Processing Technology, 51: 19-45.

40. Vassilev, S., Kitano, K., Vassileva, C. 1997. Relations between ash yield and chemical and mineral composition of coals. Fuel, 76: 3-8.

41. Vassilev, S., Vassileva, C. 1996. Occurrence, abundance and origin of minerals in coals and coal ashes. Fuel Processing Technology, 48: 85-106.

42. Vassilev, S., Kitano, K., Vassileva, C. 1996. Some relationships between coal rank and chemical and mineral composition. Fuel, 75: 1537-1542.

43. Vassilev, S., Vassileva, C. 1996. Mineralogy of combustion wastes from coal-fired power stations. Fuel Processing Technology, 47: 261-280.

44. Vassilev, S., Kitano, K., Takeda, S., Tsurue, T. 1995. Influence of mineral and chemical composition of coal ashes on their fusibility. Fuel Processing Technology, 45: 27-51.

45. Vassilev, S., Yossifova, M., Vassileva, C. 1994. Mineralogy and geochemistry of Bobov Dol coals, Bulgaria. International Journal of Coal Geology, 26: 185-214.

46. Vassilev, S. 1994. Trace elements in solid waste products from coal burning at some Bulgarian thermoelectric power stations. Fuel, 73: 367-374.

47. Vassilev, S. 1992. Phase mineralogy studies of solid waste products from coal burning at some Bulgarian thermoelectric power plants. Fuel, 71: 625-633.

OTHER PUBLICATIONS:

48. Kostova, I., Vassileva, C., Dai, S., Vassilev, S., Apostolova, D., Darakchieva, V. 2012. Influence of surface area properties on mercury capture behaviour of coal fly ashes from some Bulgarian power plants. In: Proceedings of the 64th Annual Meeting of International Committiee for Coal and Organic Petrology (ICCP), Beijing, September 14-22, 2012, 52-54.

49. Andersen, L., Morgan, T., Vassilev, S., Boulamanti, A., Giuntoli, J., Adanouj, I., Dean, C., Fennell, P., Vassileva, C., Baxter, D. 2011. Variation in chemical composition and certification of biomass. Proceedings of the 19th European Biomass Conference and Exhibition, 06-10 June 2011, Berlin, Germany: 1958-1961. ISBN-13: 978-88-89407-55-4.

50. Vassilev, S., Baxter, D., Andersen, L., Vassileva, C. 2011. New biomass classification based on the chemical composition. Proceedings of the 19th European Biomass Conference and Exhibition, 06-10 June 2011, Berlin, Germany: 1977-1979. ISBN-13: 978-88-89407-55-4.

51.Kostova, I., Vassileva, C., Hower, J., Mastalerz, M., Vassilev, S., Nikolova, N. 2011. Mercury in coals and fly ashes from Republika and Bobov Dol thermoelectric power plants. Comptes rendus de l'Academie Bulgare des Sciences, 64 (2): 253-262.

52. Vassilev, S., Vassileva, C., Baxter, D., Andersen, L. 2010. Relationships between chemical and mineral composition of coal and their potential applications as genetic indicators. Part 2. Mineral classes, groups and species. Geologica Balcanica, 39 (3): 43-67.

53. Vassilev, S., Vassileva, C., Baxter, D., Andersen, L. 2010. Relationships between chemical and mineral composition of coal and their potential applications as genetic indicators. Part 1. Chemical characteristics. Geologica Balcanica, 39 (3): 21-41.

54.Vassileva, C., Vassilev, S., Daher,D. 2010.Preliminary results on chemical and phase-mineral composition of Syrian petroleum coke and ash. Comptes rendus de l'Academie Bulgare des Sciences, 63(1): 129-136.

55. Vassilev, S. 2008. Some aspects about the effective and environmentally safety treatment of municipal solid wastes. Minno Delo i Geologia, 1: 20-23.

56. Vassilev, S. 2007. Basic and applied aspects of mineralogy and geochemistry of fly ashes from thermo-electric power stations. Minno Delo i Geologia, 2: 20-25.

57. Vassilev, S. 2006. Basic and applied aspects of mineralogy and geochemistry of coals. Minno Delo i Geologia, 7: 31-37.

58. Vassilev, S., Lihareva, N., Vassileva, C. 2006. Sequential leaching behaviour of some elements during chemical treatment of ceramic cenospheres from coal fly ash. Comptes rendus de l'Academie Bulgare des Sciences, 59 (7): 753-758.

59. Vassilev, S., Lihareva, N., Vassileva, C. 2006. Sequential leaching behaviour of some elements during chemical treatment of Bobov Dol coal fly ash. Comptes rendus de l'Academie Bulgare des Sciences, 59 (6): 645-650.

60.Vassilev, S. 2005. Mineralogy and geochemistry of coals and their combustion solid waste products. DSc Dissertation, CLMC-BAS, Sofia: Vol. I - 263 p.; Vol. II - 440 p.; Abstract - 73 p.

61. Vassilev, S., Vassileva, C. 2005. Mineralogy and geochemistry of coals and their combustion and pyrolysis products. Anniversary Volume “Ten Years of CLMC-BAS”, Sofia, Marin Drinov: 33-40. 

62. Vassileva, C., Vassilev, S. 2004. Some environmental aspects related to sulphur emissions during combustion of Bulgarian coals. Comptes rendus de l'Academie Bulgare des Sciences, 57 (9): 29-32.

63. Vassileva, C., Vassilev,S. 2002. Generalobservationsonthephase-mineraltransformationsininorganicmatterofsomeBulgariancoalsduringheating. Comptesrendusdel'AcademieBulgaredesSciences, 55 (7): 47-50.

64. Vassileva, C., Vassilev,S. 2002. Relationsbetweenash-fusiontemperaturesandchemicalandmineralcompositionofsomeBulgariancoals. Comptesrendusdel'AcademieBulgaredesSciences, 55 (6): 61-66.

65. Eskenazy, G., Vassilev, S. 2001. Geochemistry of chlorine and bromine in Bulgarian coals. Review of the Bulgarian Geological Society, 62 (1-3): 37-46.

66. Vassilev, S., Menendez, R., Alvarez, D., Borrego, A. 2001. Multicomponent utilization of fly ash: dream or reality. Proceedings of the International Ash Utilization Symposium, Lexington, KY, USA, October 22-24, 2001: 216-236.

67. Tascon, J., Vassilev,S.2000.  Lamateriamineraldelcarbon: metodosdecaracterization. ProceedingsoftheVCongresoNacionaldeCienciayTechnologiadelCarbon, Novembre29 - Decembre2, 2000, Valledupar, Columbia: 19-23.

68. Vassilev, S, Braekman-Danheux, C., Moliner, R., Suelves, I. 1999. Characterization of coal chars impregnated with transition metals for low-cost catalytic NOX reduction. In: B. Li and Z. Liu (Ed.), Proceedings of the 10th International Conference on Coal Sciences, Shanxi Science and Technology Press, September 12-17, 1999, Taiyuan, Shanxi, China, Volume II: 1517-1520.

69. Moliner, R., Lazaro, M., Suelves, I., Braekman-Danheux, C., Vassilev, S. 1999. NOX reduction on coal chars doped with petroleum ashes. In: B. Li and Z. Liu (Ed.), Proceedings of the 10th International Conference on Coal Sciences, Shanxi Science and Technology Press, September 12-17, 1999, Taiyuan, Shanxi, China, Volume II: 1513-1516.

70. Eskenazy, G., Vassilev, S., Karaivanova, E. 1998. Chlorine and bromine in the Pirin coal deposit, Bulgaria. Review of the Bulgarian Geological Society, 59 (2): 67-72.

71. Braekman-Danheux, C., Moliner, R., Fontana, A., Vassilev, S., Suelves, I. 1998. Coal chars doped with transition metals as low cost catalytic sorbents for NOx reduction. In: P. Rahimi and M. Fatemi (Ed.), Preprints of Symposia of the 216th American Chemical Society (ACS), August 22-27, 1998, Boston, USA, Volume 43, No. 4: 857-861.

72. Moliner, R.,Braekman-Danheux, C., Fontana, A., Suelves, I., Thiemann, T., Vassilev, S. 1998. Low cost catalytic sorbents for NOX reduction based on coal chars doped with transition metals. In: D. McCaffrey (Ed.), Proceedings of the 3rd International Conference on Coal Utilization Science and Technology (CUSTNET), May 6-7, 1998, Bucharest, Romania, Session 3: 41-1 - 41-6.

73. Vassilev, S., Eskenazy, G., Karaivanova, E., 1997. Chlorine and bromine in Bulgarian coals and their combustion wastes. Comptes rendus de l'Academie Bulgare des Sciences, 50 (7-8): 45-48.

74. Vassileva, B., Vassilev, S., Vassileva, C. 1996. Effective use of mineral sorbents for purification of waste waters from thermo-electric power stations. Comptes rendus de l'Academie Bulgare des Sciences, 49 (4): 59-62.

75. Vassilev, S., Kitano, K., Takeda, S., Tsurue, T. 1995. Relationship between fusibility and mineral and chemical composition of coal ashes. Comptes rendus de l'Academie Bulgare des Sciences, 48 (7): 51-54.

76. Vassilev, S. 1995. Stack emissions from coal-fired power stations: an environmental pollution with trace elements. Comptes rendus de l'Academie Bulgare des Sciences, 48 (4): 45-47.

77. Vassilev, S., Eskenazy, G., Tarassov, M., Dimov, V. 1995. Mineralogy and geochemistry of a vitrain lens with unique trace element content from the Vulche Pole coal deposit, Bulgaria. Geologica Balcanica, 25 (3/4): 111-123.

78. Vassilev, S., Yossifova, M., Valceva, S. 1995. Petrographical, mineralogical and chemical composition of coals and waste products from Bobov Dol Central Coal-tretment Plant. II. Mineralogical and chemical composition. Annuaire de l'Universite de Sofia, Livre 1-Geologie, 87: 103-123.

79. Yossifova, M., Valceva, S., Vassilev, S. 1995. Petrographical, mineralogical and chemical composition of coals and waste products from Bobov Dol Central Coal-tretment Plant. I. Petrographical composition. Annuaire de l'Universite de Sofia, Livre 1-Geologie, 87: 85-101.

80. Vassilev, S. 1995. Phase-mineralogical studies on solid waste products from burning of Bobov Dol coal at "Bobov Dol" thermo-electric power plant. Annuaire de l'Universite de Sofia, Livre 1-Geologie, 84: 85-108.

81. Vassilev, S., Kitano, K., Takeda, S., Tsurue, T. 1994. Influence of mineral and chemical composition of coal ashes on their fusibility. Proceedings of the Conference on Waste Materials and Environmental Resources, Huis Ten Bosch, Nagasaki, Japan, June 9-10, 1994: 119-122. (in Japanese).

82. Vassilev, S. 1993. Some notes on the mineralogical and geochemical studies of coal during heating. Comptes rendus de l'Academie Bulgare des Sciences, 46 (6): 57-59.

83. Yossifova, M., Vassilev, S. 1993. Phase-mineralogical composition and trace elements in solid waste products at some Bulgarian coal-treatment plants. In: K. Skarzynska (Ed.), Proceedings of the Fourth International Symposium on the Reclamation, Treatment and Utilization of Coal Mining Wastes, September 6-10, 1993, Krakow, Poland, vol. II: 973-979.

84. Vassilev, S. 1993. Phase-mineralogical composition and trace elements in fly ashes from coal burning at Bulgarian thermoelectric power stations. In: K. Skarzynska (Ed.), Proceedings of the Fourth International Symposium on the Reclamation, Treatment and Utilization of Coal Mining Wastes, September 6-10, 1993, Krakow, Poland, vol. I: 203-210.

85. Vassilev, S., Vassileva, B. 1992. Element composition of waste waters from thermo-electric power plants. Comptеs rendus de l'Academie Bulgare des Sciences, 45 (7): 49-52.

86. Vassilev, S., Yossifova, M., Valceva. S. 1991. Mineralogy-petrographical characteristic of waste products from upgrading of Bobov Dol coal - a base for the complex estimation in order to use them. Minno Delo, 2: 16-19.

87. Vassilev, S. 1991. Chlorine content in Donbass coals and waste products from TPP. Petroleum and Coal Geology, 28: 46-51.

88. Vassilev, S. 1991. Phase-mineralogical and chemical composition of solid waste products from Bulgarian TPP. PhD Dissertation, CLMC-BAS, Sofia: 222 p.; Abstract: 41 p.

89. Vassilev, S. 1990. Phase-mineralogical studies of waste products from burning of Maritza-East lignites in TPP.  Review of the Bulgarian Geological Society, 51 (2): 35-45.

90. Vassilev, S., Zotov, N. 1989. X-ray study of phase composition of bottom ashes, fly ashes and ash mixtures from burning of Maritza-East lignites in the Maritza-East 1 TPP. Petroleum and Coal Geology, 25: 57-64.