Professor, PhD

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

Phone: 0887447229

Fax: 0887447229

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 Biographical notes


  • University education: 1993-1997, University of Chemical Technology and Metallurgy (UCTM) -Sofia, Department of Chemical Engineering
  • M.Sc. in Chemistry, 1997, University of Chemical Technology and Metallurgy (UCTM) -Sofia, Bulgaria,
  • Ph.D. in Physics, 2006, University of Chemical Technology and Metallurgy (UCTM) -Sofia, Bulgaria, Thesis title: Structure of vitreous B2O3.


  • University of Pittsburgh School of Medicine, Department of Structural Biology 2007-2008, Pittsburgh, USA,
  • Bourse du Gouvernement Francais, Ecole Nationale Superieure de Chimie, (ENSCT) 1998-1999, Toulouse, France.


  • Crystallography, hydrogen bonding interactions, bioactive, anticonvulsant, antitumor compounds, protein crystallography, Solid state physics in complex oxide materials, boron, tellurite and silicate glasses and crystals, bio-ceramics and nano-structured materials.


  • TK 358/08 NSFB "Novel biodegradable nanostructured materials accelerating osteogenesis"2008 – 2010,
  • ТК– Х 1715/07 NSFB  "Modeling and modification of physical parameters of crystals for optical storage and data manipulation" 2008 – 2010,
  • ДОО2-305 NSFB„New multi-component tellurite matrices with NLO properties” 2009 - 2011.
  • РНФ 09/001 "Структурна характеристика на Нови Кристални Материали", 2010 - 2011.


  • ВУХ-01.05 NSFB„Synthesis, Structure and metal binding properties of a series of cycloalkane-5-spirohydantoines and their thio- analogs 2005–2008,
  • 039 SU „New Rucomplexes with aza containing ligands as potential antitumor compounds: synthesis, structure and properties" 2006 – 2008,
  • ВУ-ТН-965 NSFB „ Rare earth Selenides as new semiconductor materials" 2007 – 2009,


  • 2009, 2007, 2006, General Physics I & II Technical University (TU), Sofia, Bulgaria
  • 2005, 2004, General Physics I & II University of Chemical Technology and Metallurgy (UCTM), Sofia, Bulgaria



[89] Burdzhiev, N., E. Stanoeva, B. Shivachev and R. Nikolova. "Synthesis and Transformations of Polysubstituted Diastereomeric 5-Oxomorpholin-2-Carboxylic Acids." Comptes Rendus Chimie 17, no. 5 (2014): 420-430. 

[88] Deneva, V., Y. Manolova, L. Lubenov, V. Kuteva, F. S. Kamounah, R. Nikolova, B. Shivachev and L. Antonov. "Controlled Shift in the Tautomeric Equilibrium of 4-((Phenylimino)Methyl) Naphthalen-1-Ol." Journal of Molecular Structure 1036,  (2013): 267-273. or Science direct link

[87] Dimowa, L., S. Atanassova-Vladimirova, I. Piroeva, B. Ranguelov and B. L. Shivachev. "Antibacterial Activity of Ag-, Zn-, Cd-, Ba-Modified Natural Clinoptilolite against Escherichia Coli." Comptes Rendus de L'Academie Bulgare des Sciences 67, no. 11 (2014): 1531-1538.

[86] Dimowa, L., K. Kossev, H. I. Sbirkova, R. P. Nikolova and B. L. Shivachev. "Synthesis and Crystal Structure of Oxonium 2,4,8,10-Tetra-Hydroxy-1,3,5,7, 9,11-Hexaoxa-2,4,6,8,10-Penta-Boraspiro[5.5]Undecan-6-Uide Hydrate." Bulgarian Chemical Communications 45, no. 4 (2013): 505-509.

[85] Dimowa, L., B. Shivachev and S. Petrov. "Design and Application of a Cost Effective High Temperature Holder for in-Situ Powder X-Ray Diffraction Experiments." Bulgarian Chemical Communications 45, no. 4 (2013): 479-484.

[84] Dimowa, L. T., S. L. Petrov and B. L. Shivachev. "Natural and Zn Exchanged Clinoptilolite: In Situ High Temperature XRD Study of Structural Behavior and Cation Positions." Bulgarian Chemical Communications 45, no. 4 (2013): 466-473.

[83] Ivanov, V. G., V. G. Hadjiev, A. P. Litvinchuk, D. Z. Dimitrov, B. L. Shivachev, M. V. Abrashev, B. Lorenz and M. N. Iliev. "Lattice Dynamics and Spin-Phonon Coupling in Camn2 O4: A Raman Study." Physical Review B - Condensed Matter and Materials Physics 89, no. 18 (2014).

[82] Jashari, A., E. Popovski, B. Mikhova, R. P. Nikolova and B. L. Shivachev. "3-[2-(5-Tert-Butyl-1,2-Oxazol-3-Yl)Hydrazinylidene]Chroman-2,4-Dione." Acta Crystallographica Section E: Structure Reports Online 69, no. 2 (2013).

[81] Kolev, I. N., S. P. Petrova, R. P. Nikolova, L. T. Dimowa and B. L. Shivachev. "Synthesis, Characterization, and Crystal Structure of 2-Iodo-3,4,5- Trimethoxybenzoic Acid." Journal of Molecular Structure 1034,  (2013): 318-324.

[80] Kossev, K., H. Sbirkova, N. Petrova, B. Shivachev and R. Nikolova. "Crystal Structure and Properties of Urea and Thiourea Adducts of Tetraalkyl Ammonium Hydrogen Sulphate." Bulgarian Chemical Communications 45, no. 4 (2013): 446-454.

[79] Kossev, K., L. Tsvetanova, L. Dimowa, R. Nikolova and B. Shivachev. "Synthesis and Crystal Structure of Magnesium Chlorate Dihydrate and Magnesium Chlorate Hexahydrate." Bulgarian Chemical Communications 45, no. 4 (2013): 543-548.

[78] Kraicheva, I., E. Vodenicharova, B. Shivachev, R. Nikolova, A. Kril, M. Topashka-Ancheva, I. Iliev, A. Georgieva, T. Gerasimova, T. Tosheva, E. Tashev, I. Tsacheva and K. Troev. "Anthracene-Derived Bis-Aminophosphonates: Crystal Structure, in Vitro Antitumor Activity, and Genotoxicity in Vivo." Phosphorus, Sulfur and Silicon and the Related Elements 188, no. 11 (2013): 1535-1547.

[77] Marinova, M., K. Kostova, P. Tzvetkova, M. Tavlinova-Kirilova, A. Chimov, R. Nikolova, B. Shivachev and V. Dimitrov. "Synthesis of 1,3-Aminonaphthols by Diastereoselective Betti-Type Aminoalkylation of Dihydroxy Naphthalenes; Diastereoselectivity, Absolute Configuration, and Application." Tetrahedron Asymmetry 24, no. 23 (2013): 1453-1466.

[76] Nikolova, R. P., B. Shivachev, B. Mikhova, B. Stamboliyska, K. Mladenovska, A. P. Panovska and E. Popovski. "Synthesis and Structure of (R,S)-2-Methyl-4-(4-Nitrophenyl)-Pyrano[3,2-C] Chromen-5(4h)-One." Macedonian Journal of Chemistry and Chemical Engineering 32, no. 2 (2013): 239-250.

[75] Piroeva, I., S. Atanassova-Vladimirova, L. Dimowa, H. Sbirkova, G. Radoslavov, P. Hristov and B. L. Shivachev. "A Simple and Rapid Scanning Electron Microscope Preparative Technique for Observation of Biological Samples: Application on Bacteria and DNA Samples." Bulgarian Chemical Communications 45, no. 4 (2013): 510-515.

[74] Piroeva, I., L. Dimowa, S. Atanasova-Vladimirova, N. Petrova and B. L. Shivachev. "Synthesis, Structural and Optical Characterization of Teo 2-Geo2-Nd2o3 Glasses." Bulgarian Chemical Communications 45, no. 4 (2013): 491-496.

[73] Sbirkova, H. I., G. A. Radoslavov, P. I. Hristov and B. L. Shivachev. "Crystallographic Conditions of the Heterologically Expressed Recombinant Metal-Binding Protein Ts-Pchtp." Bulgarian Chemical Communications 45, no. 4 (2013): 440-445.

[72] Shivachev, B. "DHA, a Program for Calculating Hydrogen Atom Coordinates of Solvent Atom Involved in Hydrogen Bonding Interactions." Bulgarian Chemical Communications 45, no. 4 (2013): 461-465.

[71] Staneva, A. D., B. S. Blagoev, B. L. Shivachev, A. J. Zaleski, V. Mikli, J. B. Mateeva, Y. B. Dimitriev and A. K. Stoyanova-Ivanova. "Effect of Heat Treatment on the Phase Transformation and Magnetic Properties of Bpscco/Lpmo Composites." Journal of Alloys and Compounds 582,  (2014): 223-228.

[70] Stoyanova, M. P., B. L. Shivachev, R. P. Nikolova and V. Dimitrov. "Highly Efficient Synthesis of Chiral Aminoalcohols and Aminodiols with Camphane Skeleton." Tetrahedron Asymmetry 24, no. 21-22 (2013): 1426-1434.

[69] Yankov, G., I. Stefanov, Kr Dimitrov, I. Piroeva, L. T. Dimowa, M. P. Tarassov, B. L. Shivachev, H. Yoneda and T. Petrov. "Measurement of Nonlinear Refractive Index and Multiphoton Absorption by the Subpicosecond Z-Scan Method of Tellurite Multicomponent Glassy Matrixes Having Nonlinear Susceptibility." In Physica Scripta, T157, 2013.

[68] BL Shivachev, K Kossev, LT Dimowa, G Yankov, T Petrov, RP Nikolova, N Petrova, Synthesis, growth, structural, thermal, optical properties of new metal-organic crystals: Methyltriphenylphosphonium iodide thiourea and ethyltriphenylphosphonium iodide chloroform hemisolvate, Journal of Crystal Growth, Volume 376, 1 August 2013, Pages 41–46

[67] Stanislav Ferdov, Evelina Shikova, Zina Ivanova, Louiza T. Dimowa, Rositsa P. Nikolova, Zhi Lin and Boris L. Shivachev, A microporous titanosilicate for selective killing of HeLa cancer cells, RSC Advances, 2013,3, 8843-8848.

[66] R.P. Nikolova, B.L. Shivachev, S. Ferdov, Crystal structures of Mg2+, Ba2+ and Cs+ exchanged K–Na–ETS-4, Microporous and Mesoporous Materials, 165 (2013) 121-126.

[65] B.S. Blagoev, S.D. Terzieva, T.K. Nurgaliev, B.L. Shivachev, A.J. Zaleski, V. Mikli, A.D. Staneva, A.K. Stoyanova-Ivanova, Magnetic and transport characteristics of oxygenated polycrystalline La0.6Pb0.4MnO3, Journal of Magnetism and Magnetic Materials, 329 (2013) 34-38.

[64] G. Yankov, L. Dimowa, N. Petrova, M. Tarassov, K. Dimitrov, T. Petrov, B.L. Shivachev, Synthesis, structural and non-linear optical properties of TeO2–GeO2–Li2O glasses, Optical Materials, 35 (2012) 248-251.

[63] S. Stoyanov, P. Petrov, M. Stoyanova, M. Dangalov, B. Shivachev, R. Nikolova, I. Petkov, 4-Amino-3-nitro naphthalimides—Structures and spectral properties, Journal of Photochemistry and Photobiology A: Chemistry, 250 (2012) 92-98.

[62] G.M. Dobrikov, I. Philipova, R. Nikolova, B. Shivachev, A. Chimov, V. Dimitrov, Functionalized organolithium reagents in the synthesis of chiral ligands for catalytic enantioselective addition of diethylzinc to aldehydes, Polyhedron, 45 (2012) 126-143.

[61] P.T  . Todorov, N.D. Pavlov, B.L. Shivachev, R.N. Petrova, J. Martinez, E.D. Naydenova, M. Calmes, Synthesis of new racemic and optically active N-phosphonoalkyl bicyclic ss-amino acids via the kabachnik-fields reaction as potential biologically active compounds, Heteroatom Chem, 23 (2012) 123-130.

[60] P.T. Todorov, R.P. Nikolova, E.D. Naydenova, B.L. Shivachev, Synthesis and Structural Characterization of Spiro(fluorene-9,4'-imidazolidine)-2',5'-dione and (9H-Fluorene-9-yl)urea, J Chem Crystallogr, 42 (2012) 566-572.

[59] N.D. Todorov, M.V. Abrashev, S.C. Russev, V. Marinova, R.P. Nikolova, B.L. Shivachev, Raman spectroscopy and lattice-dynamical calculations of Sc3CrO6 single crystals, Phys Rev B, 85 (2012).

[58] V.B. Kurteva, L.M. Antonov, D.V. Nedeltcheva, A. Crochet, K.M. Fromm, R.P. Nikolova, B.L. Shivachev, M.S. Nikiforova, Switching azonaphthols containing a side chain with limited flexibility. Part 1. Synthesis and tautomeric properties, Dyes Pigments, 92 (2012) 1266-1277.

[57] I. Philipova, G. Stavrakov, V. Dimitrov, Camphane-based phosphino-carboxamide ligands as P,O-chelates in Pd-catalyzed enantioselective allylic alkylation, Tetrahedron: Asymmetry, 23 (2012) 927-930.

[56] V. Dyulgerov, R.P. Nikolova, L.T. Dimova, B.L. Shivachev, 3-Carboxy-phenyl-boronic acid-theophylline (1/1), Acta crystallographica. Section E, Structure reports online, 68 (2012) o2320.

[55] P. Todorov, M. Calmes, B.L. Shivachev, R.P. Nikolova, (R)-Methyl {[(2-carb-oxy-bicyclo-[2.2.2]octan-1-yl)-ammonio]-methyl}-phos-phon-ate dichloro-methane 0.25-solvate, Acta crystallographica. Section E, Structure reports online, 67 (2011) o2152-2153.

[54] P. Todorov, M. Calmes, B.L. Shivachev, R.P. Nikolova, (R)-Methyl {[(2-carboxybicyclo[2.2.2]octan-1-yl)ammonio]methyl}phosphonate dichloromethane 0.25-solvate, Acta Crystallogr E, 67 (2011) O2152-U1578.

53. A. Stoyanova-Ivanova, S. Georgieva, T. Nedeltcheva, L. Dimova, B. Shivachev, Variation of the unit cell parameters of the REBa(2)Cu(3)O(y) (RE = Gd, Er) ceramics in function of the oxygen content, Bulg Chem Commun, 43 (2011) 320-324.

52. S. Stanchev, R.P. Nikolova, B.L. Shivachev, I. Manolov, Crystal structure of 3-oxo-2-(4-hydroxybenzylidene)-butyric acid ethyl ester, Bulg Chem Commun, 43 (2011) 316-319.

[51] I. Philipova, G. Stavrakov, A. Chimov, R. Nikolova, B. Shivachev, V. Dimitrov, Synthesis of ferrocene-based amido-phosphine ligands via highly diastereoselective ortho-lithiation and their application in Pd-catalyzed asymmetric allylic alkylations, Tetrahedron-Asymmetr, 22 (2011) 970-979.

50. L. Ivanova, C. Popov, I. Kolev, B. Shivachev, J. Karadjov, M. Tarassov, W. Kulisch, J.P. Reithmaier, M.D. Apostolova, Nanocrystalline diamond containing hydrogels and coatings for acceleration of osteogenesis, Diamond and Related Materials, 20 (2011) 165-169.

49. P.J. Gorolomova, R.P. Nikolova, B.L. Shivachev, V.I. Ilieva, D.T. Tsekova, T.D. Tosheva, E.S. Tashev, S.G. Varbanov, G.G. Gencheva, Theoretical and experimental studies on the coordination ability of 1,4-bis(dimethylphosphinylmethyleneoxy)benzene, Bulg Chem Commun, 43 (2011) 244-253.

48. M. Gerova, R. Nikolova, B. Shivachev, O. Petrov, Synthesis and crystal structure of 2-[(2,3-dihydro-2-oxo-3-benzoxazolyl)methyl]benzoic acid, Bulg Chem Commun, 43 (2011) 230-235.

47. L. Dimova, B.L. Shivachev, R.P. Nikolova, Single crystal structure of pure and Zn ion exchanged clinoptilolite: Comparison of low temperature and room temperature structures and Cu vs. Mo radiation, Bulg Chem Commun, 43 (2011) 217-224.

46. J. I. Yeh, Boris Shivachev, Srinivas Rapireddy, Matthew J. Crawford, Roberto R. Gil, Shoucheng Du, Marcela Madrid and Danith H. Ly. (2010) Crystal Structure of Chiral γPNA with Complementary DNA Strand: Insights into the Stability and Specificity of Recognition and Conformational Preorganization. J. Am. Chem. Soc., DOI: 10.1021/ja907225d. 

45. Stoyanova, M. P., Angelova, S. E., Petrov, P. Y., Nikolova, R. P., & Shivachev, B. L. (2010). Synthesis of 1,2,3,4-substituted spiroheterocyclic tetrahydroisoquinoline- 1-ones and their structural similarity in water solution and in crystallohydrate solid state. Arkivoc, 2010(2), 303-314. 

44. Bistra Stamboliyska, Voislava Janevska, Boris Shivachev, Rosica P. Nikolova, Goran Stojkovic, Bozhna Mikhova and Emil Popovskib. (2010) Experimental and theoretical investigation of the structure and nucleophilic properties of 4-aminocoumarin. Arkivoc, 2010, 62-76.

43. Apostolova, M. D., Nikolova, R. P., & Shivachev, B. L. (2010). (4-carbamoylphen-yl) boronic acid. Acta Crystallographica E, 66(6) . 

42. Todorov, P., Naydenova, E., Nikolova, R. P., & Shivachev, B. L. (2010). Ammonium hydrogen (RS)-[(5-methyl-2-oxo-1,3-oxazolidin-3-yl)methyl]phospho- nate. Acta Crystallographica E, 66(1) . 

41. Trajkovski, B., Karadjov, J., Shivachev, B., Dimitrova, A., Stavrev, S., & Apostolova, M. D. (2009). Novel nanostructured materials accelerating osteogenesis. NATO Science for Peace and Security Series B: Physics and Biophysics, 2009, VI, Part 12, 525-532. PDF

40. Pantcheva, I. N., Dorkov, P., Atanasov, V. N., Mitewa, M., Shivachev, B. L., Nikolova, R. P., et al. (2009). Crystal structure and properties of the copper(II) complex of sodium monensin A. Journal of Inorganic Biochemistry, 103(10), 1419-1424. PDF

39. Shivachev, B. L., Petrov, T., Yoneda, H., Titorenkova, R., & Mihailova, B. (2009). Synthesis and nonlinear optical properties of TeO2-Bi2O3-GeO2 glasses. Scripta Materialia, 61(5), 493-496. PDF

38. Shivachev, B., Petrov, P., & Stoyanova, M. (2009). Synthesis and crystal structure of 4-methyl-6H-pyrido[3,2,1-jk]carbazol-6- one. Journal of Chemical Crystallography, 39(3), 209-212. 

37. Todorov, P. T., Petrova, R. N., Naydenova, E. D., & Shivachev, B. L. (2009). Structure, conformation and hydrogen bonding of two amino-cycloalkanespiro-5-hydantoins. Central European Journal of Chemistry, 7(1), 14-19. PDF

36. Terzieva, S. D., Stoyanova-Ivanova, A. K., Shivachev, B. L., Terzijska, B. M., Zaleski, A. J., Misiorek, H., et al. (2009). Microstructure and thermal properties of quasi-equal rare earth substitution Y0.5Gd0.5Ba2Cu3 O6.94 superconductor. Central European Journal of Physics, 7(1), 84-88. 

35. Petar Y. Petrov, Nikolay G. Vassilev, Silvia E. Angelova, Boris L. Shivachev and Galin P. Petrov. (2009) Mechanism and Stereoselectivity of the Phosphinylation of 3-Acyl Coumarins - Stereocontrol Via Concurrent Aromatic Interaction/Oxaphosphole Formation. Letters in Organic Chemistry, 6/2, 180-185. PDF

34. Atanassova, M., Lachkova, V., Vassilev, N., Shivachev, B., Varbanov, S., & Dukov, I. (2008). Effect of p-tert-butylcalix[4]arene fitted with phosphinoyl pendant arms as synergistic agent in the solvent extraction of trivalent lanthanoids with 4,4,4-trifluoro-1-(2-thienyl)-1,3-butanedione and structural study of solid complexes by IR, NMR and X-ray. Polyhedron, 27(15), 3306-3312. 

33. Nikolova, R. P., Kolev, T., Statkova-Abeghe, S. M., & Shivachev, B. L. (2008). (±)-Ethyl 6,7-dimethoxy-1-(1H-pyrrol-2-yl)-1,2,3,4-tetra- hydroisoquinoline-2-carboxylate. Acta Crystallographica E, 64(9) . 

32. Kolev, Ts., Koleva, B.B., Schivachev, B. (2008). Oriented solids as a colloid suspension in nematic liquid crystal - New tool for IR-spectroscopic and structural elucidation of inorganic compounds and glasses. Inorganica Chimica Acta, 361 (7), 2002-2012. PDF

31. Georgieva, G., Gencheva, G., Shivachev, B. L., & Nikolova, R. P. (2008). A new monoclinic polymorph of dichlorido-tetra-kis(dimethyl sulfoxide)-ruthenium(II). Acta Crystallographica E, 64(8) . 

30. Stoyanova-Ivanova, A. K., Terzieva, S. D., Shivachev, B. L., Mikli, V., & Vladimirova, L. K. (2008). Synthesis and superconducting properties of Nd0.33 Eu0.08Gd0.58Ba2Cu3 oz materials. Central European Journal of Physics, 6(1), 76-79. 

29. Petrov, P. Y., Stoyanova, M., & Shivachev, B. (2008). 4-methyl-1-phenylquinolin-2(1H)-one. Acta Crystallographica E, 64(1) . 

28. Kandinska, M. I., Todorov, I. S., Shivachev, B., & Bogdanov, M. G. (2007). Trans-rac-2-hexyl-1-oxo-3-(2-pyridyl)-1,2,3,4-tetrahydroisoquinoline-4- carboxylic acid. Acta Crystallographica E, 63(5), o2544-o2546. PDF

27. Kolev, T., Shivachev, B., & Petrova, R. (2007). 4-phenylpyridinium 3-carboxy-2,3-dihydroxypropanoate dihydrate. Acta Crystallographica E, 63(5) . 

26. Zidarov, N., Shivachev, B., Kalvachev, Y., & Stanchev, H. (2007). Caledonite from madan ore district, central rhodopes, south bulgaria. Comptes Rendus De L'Academie Bulgare Des Sciences, 60(12), 1303-1308. 

25. Petrova, R., Titorenkova, R., & Shivachev, B. (2007). Isoquinolin-1(2H)-one. Acta Crystallographica E, 63(12) . PDF

24. Bakalova, A., Petrova, R., Shivachev, B., & Varbanov, H. (2007). Synthesis and crystal structure of a pt(II) complex with 3-amino-5-methyl-5-phenylhydantoin. Journal of Coordination Chemistry, 60(15), 1701-1707. PDF 

23. Kolev, T., Shivachev, B., Petrova, R., Ivanov, I., Atanasova, S., & Statkova, S. (2007). 1,2,3,4-tetra-hydro-isoquinolinium hydrogensquarate. Acta Crystallographica E, 63(8), o3353-o3354. PDF

22. Kolev, T., Yancheva, D., Shivachev, B., & Petrova, R. (2007). The pyridinium-betaine of squaric acid. Acta Crystallographica E, 63(7). PDF 

21. Todorov, P., Naydenova, E., Petrova, R., Shivachev, B., & Troev, K. (2006). [(4,4-dimethyl-2-oxo-1,3-oxazolidin-3-yl)methyl]phosphonic acid. Acta Crystallographica Section C: Crystal Structure Communications, 62(11), o661-o662.

20. Shivachev, B., Petrova, R., & Naydenova, E. (2006). 3prime;-aminocyclohexanespiro-5′-hydantoin-phenylboronic acid (1/1). Acta Crystallographica E, 62(9), o3887-o3889.

19. Petrova, N., Shivachev, B., Kolev, T., & Petrova, R. (2006). Sodium hydrogensquarate monohydrate. Acta Crystallographica E, 62(6), m1359-m1361.

18. Shivachev, B., Petrova, R., Marinova, P., Stoyanov, N., Ahmedova, A., & Mitewa, M. (2006). Four cycloalkanespiro-4′-imidazolidine-2′,5′-dithiones. Acta Crystallographica Section C: Crystal Structure Communications, 62(4), o211-o215.

17. Kolev, T., Bakalska, R., Shivachev, B., & Petrova, R. (2006). Codeinone. Acta Crystallographica E, 62(1), o255-o257.

16. Kolev, T., Bakalska, R., Shivachev, B., & Petrova, R. (2005). 6-O-acetylcodeine. Acta Crystallographica E, 61(8), o2582-o2584.

15. Shivachev, B., Petrova, R., & Naydenova, E. (2005). Dimorphism in 3′-aminocyclohexane-spiro-5′-hydantoin. Acta Crystallographica Section C: Crystal Structure Communications, 61(8), o524-o526.

14. Petrova, R., Shivachev, B., Kosev, K., Stoyanova, M., & Angelova, S. (2005). (3RS/4RS)-3-(2-furyl)-2-phenethyl-4-(pyrrolidin-1-yl-carbonyl)-3, 4-dihydroisoquinolin-1 (2H)-one. Acta Crystallographica E, 61(7), o2248-o2250.

13. Kashchieva, E., Shivachev, B., & Dimitriev, Y. (2005). Molecular dynamics studies of vitreous boron oxide. Journal of Non-Crystalline Solids, 351(12-13), 1158-1161.

12. Shivachev, B., Kashchieva, E., & Dimitriev, Y. (2005). DFT calculations of cluster formation in vitreous B2O 3. Physics and Chemistry of Glasses, 46(2), 253-255.

11. Kolev, T., Yancheva, D., Shivachev, B., Petrova, R., & Spiteller, M. (2005). 2-(3-benzoyl-1-pyridinio)-3,4-dioxo-cyclobutenolate. Acta Crystallographica Section C: Crystal Structure Communications, 61(4), o213-o215.

10. Kolev, T., Yancheva, D., Shivachev, B., Petrova, R., & Spiteller, M. (2005). 2-{3-[(E)-(3,4-dimethoxyphenyl)ethenyl]-5,5-dimethylcyclohex-2-enylidene} malononitrile. Acta Crystallographica E, 61(3), o550-o552.

9. Shivachev, B., Petrova, R., Kossev, K., & Troev, K. (2005). [1-(hydroxyethylammonio)propyl]phosphonate. Acta Crystallographica E, 61(1), o134-o136.

8. Shivachev, B. L., Mincov, I. P., Kashchieva, E. P., Dimitriev, Y. B., Smith, R., & Troev, T. (2004). Positron lifetime spectroscopy of vitreous B2O3. Journal of Non-Crystalline Solids, 345-346, 108-111.

7. T. Troev, B. Shivachev and T. Yoshiie. Positron Lifetime Calculations of Defects in Nickel Containing Hydrogen at Various Temperatures, Materials Science Forum, 445/446 (2004) 198 .

6. Shivachev, B. L., Troev, T., & Yoshiie, T. (2002). Positron lifetime computations of defects in nickel containing hydrogen or helium. Journal of Nuclear Materials, 306(2-3), 105-111.

5. I. Minkov, V. Ganev, T. Troev, B. Shivachev, Temperature dependence of crystallization in Fe78Si9B13 and Co75Si15B10 amorphous alloys using positron-anihilation lifetime spectroscopy and powder X-ray diffraction, Meeting in Physics Uni. Sofia, ed. A. Proykova, vol.4 Heron Press, Sofia, (2003) 133.

4. B.Shivachev, E.Kashchieva, Y. Dimitriev, I. P. Minkov. Positron lifetime investigation of vitreous B2O3,Glass Sci.Technol.75 C2 (2002) 389.

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