1. A.P. Tonchev, F. Harmon, B.D. King. Excitation of the ^180mTa Isomer in (g,n) Reactions. Application of Accelerators in Research and Industry. Proceedings of the Fifteenth International Conference, Denton, Texas, (1998) 231-234.
2. R. Brey, F. Harmon, D. Wells, A. Tonchev. Photon Activation Analysis of Radionuclides at Environmental-Levels. The 6^th International Conference on Nuclear Engineering, San Diego, California, USA, May 10-15 (1998) 620-621.
3. A.P. Tonchev, Yu.P. Gangrsky, A.G. Belov. New candidates for high spin isomeric targets. 1998 Symposium on Radiation Measurements and Applications, Ann Arbor, Michigan, USA, May 11-14 (1998).
4. A.P. Tonchev, J.F. Harmon, B. King. Application of low energy photon spectroscopy in isomer production of Hf, W, Ir, Pt, Au and Hg using (g,g¢) reactions from 6-9 MeV. 1998 Symposium on Radiation Measurements and Applications, Ann Arbor, Michigan, USA, May 11-14 (1998).
5. A.P. Tonchev, J.F.Harmon, R.Brey. Linac analysis of ore samples by employng photon activation of the metastable states of gold and silver. 1998 Symposium on Radiation Measurements and Applications, Ann Arbor, Michigan, USA, May 11-14 (1998).
6. A.P. Tonchev, Yu.P. Gangrsky, A.G. Belov. Excitation of high-spin isomeric states in photonuclear reactions. Advances in Nuclear Physics and Related Areas. Thessaloniki - Greece. 8 - 12 July (1997).
7. N. Balabanov, Hr. Hristov, Yu.P. Gangrsky, A. Tonchev, A. Belov. Excitation of Isomeric States in Isotones (N=82) by (g,n) Reactions. Proc. 3rd General Conference of the Balkan Physicsl Union, BPU-3, 2-5 September, 1997, Cluj-Napoca, Romania, Programme and Abstracts, 1P-023, p.41.
8. A.P. Tonchev, A.G. Belov, Yu.P. Gangrsky, N.P. Balabanov. Excitation of isomeric states h_11/2 in photonuclear reactions. Int. Conf. on Nuclear Spectroscopy and Nuclear Structure of the atomic nuclei, S.Petersburg (1995) 259 (in Russian).
9. A.P. Tonchev, A.G. Belov, Yu.P. Gangrsky, H.G. Hristov, and S.N. Dmitriev. Possibility of production of the ¹⁴³Pm isotope with microtron bremsstrahlung gamma-rays. 1994 Symposium on Radiation Measurements and Applications, Ann Arbor, Michigan, USA, May 16-19 (1994).
10. N.P. Balabanov, A.G. Belov, Yu.P. Gangrsky, F.G. Kondev, and A.P. Tonchev, Excitation Function of ¹³⁸Ce(g,n)^137mCe reaction in the Giant Dipole Resinance Region. Proceedings of the 44th Nucl. Spectroscopy and Nucl. Structure Conference at S.Petersburg, Russia (1994) 202 (in Russian).
11. N.P. Balabanov, A.G. Belov, Yu.P. Gangrsky, F.G. Kondev, A.P. Tonchev, Excitation of isomerics states in photonuclear reactions ¹⁴⁹Sm(g,p)¹⁴⁸Pm, ¹⁷⁵Lu(g,n)¹⁷⁴Lu, ^196,198Hg(g,n)^195,197Hg in giant dipole resonanse. Proceedings of the 44th Nucl. Spectroscopy and Nucl. Structure Conference at S.Petersburg, Russia (1994) 203 (in Russian).
12. A.D. Antonov, N.P. Balabanov, Hr.G. Hristov, M.P. Mitrikov, S.G. Marinova, K. Srentz, V.D. Tcholakov, A.P. Tonchev, A.G. Belov, Multielemental Gamma-and Neutron Activation Analysis of Coal and the Products of its Combustion, Balkan Physics Letters, vol. 2, part two (1994) 1869-1873.
13. N.P. Balabanov, A.G. Belov, Yu.P. Gangrsky, H.G. Hristov, F.G. Kondev, A.P. Tonchev. An Excitation of Isomeric States in the (g,n) Reactions on Heavy Nuclei. Balkan Physics Letters, vol. 2, part one (1994) 942-945.
14. N.P. Balabanov, A.G.Belov, H.G.Hristov, F.G.Kondev, A.P.Tonchev. Study of Reactions (g,n)m for Nuclei in Region 70

15. N.P. Balabanov, A.G.Belov, Yu.P.Gangrsky, H.G.Hristov, F.G.Kondev, A.P.Tonchev. An Excitation of Isomeric States in the (g,n) Reactions on Heavy Nuclei. Balkan Physics Letters, vol. 2, part one (1994) 942-945.
16. E.M. Kozulin, Yu.A. Muzichka, B.I. Pustylnik, V.S. Salamatin, A.P. Tonchev, D. Hilscher, U. Jahnke, H. Rossner, B. Gebauer, D. Polster, G. Roeschert. Investigation of neutron emission in the fission of excited compound nuclei with Z > 92. International School-Seminar on Heavy Ion Physics, Dubna, Russia, vol.1 (1993) 241-246.
17. N.P. Balabanov, Yu.P. Gangrsky, F.G. Kondev, A.P. Tonchev. Investigation of the ²³⁸U(g,a)²³⁴Th reaction on the beam of bremsstrahlung g -quanta. Proceedings of the 43rd Nucl. Spectroscopy and Nucl. Structure Conference at Dubna, Russia (1993) 399 (in Russian).
18. N.P. Balabanov, A.G. Belov, Yu.P. Gangrsky, A.P. Tonchev, F.G. Kondev, M.G. Mitrikov. Population of high spin isomers in (g,g¢) reactions. Proceedings of the 43rd Nucl. Spectroscopy and Nucl. Structure Conference at Dubna, Russia (1993) 398 (in Russian).
19. S.A. Karamian, B. Gorski, A.P. Tonchev, E.Yu. Nikolski, B.G. Novatcki. Search for long-lived Hf isomers. Proceedings of the 43rd Nucl. Spectroscopy and Nucl. Structure Conference at Dubna, Russia (1993) 99 (in Russian).
20. A.G. Belov, Yu.P. Gangrsky, F.G. Kondev, A.P. Tonchev, N.P. Balabanov. Photo-activation of ^137mCe in the region of giant dipole resonance. Workshop on the Application of Microtrons in Nuclear Physics, 22-24 September 1992, Plovdiv, Bulgaria, D15-93-80 (1992) 106-108.
21. N.P. Balabanov, H.G. Hristov, F.G. Kondev, Yu.P. Gangrsky, A.P. Tonchev. Investigation of alpha and cluster emission in photonuclear reactions in the region of giant dipole resonance. Workshop on the Application of Microtrons in Nuclear Physics, 22-24 September 1992, Plovdiv, Bulgaria, D15-93-80, (1992) 99-105 (in Russian).
22. A.G. Belov, F.G. Kondev, Yu.P. Gangrsky, A.P. Tonchev. Investigation of (g,g¢) reactions near binding neutron energy. Workshop on the Application of Microtrons in Nuclear Physics, 22-24 September 1992, Plovdiv, Bulgaria, D15-93-80 (1992) 82-92 (in Russian).
23. N.P. Balabanov, H.G. Hristov, F.G. Kondev, and A.P. Tonchev. A Possibility of Application of the Microtron MT-25 in Plovdiv University. Workshop on the Application of Microtrons in Nuclear Physics, 22-24 September 1992, Plovdiv, Bulgaria, D15-93-80 (1992) 53-62 (in Russian).
24. V.S. Salamatin, E.M. Kozulin, A.P. Tonchev, G.G. Chubarian, M.G. Itkis, A.Ya. Rusanov, G.N. Smirenkin. Investigation of nuclear fission in the Businaro-Gallone point. Proceedings of the 42nd Nucl. Spectroscopy and Nucl. Structure Conference at Alma-Ata, Kazakstan (1992) 307 (in Russian).
25. S.A. Karamyan, Yu.T. Oganesyan, A.P. Tonchev, V.G. Vinogradov. Activation of aluminum foils by 25-45 He ions. Proceedings of the 42nd Nucl. Spectroscopy and Nucl. Structure Conference at Alma-Ata, Kazakstan (1992) 291 (in Russian).
26. Yu.P. Gangrsky, A.P. Tonchev, F.G. Kondev, M. Marinov, N.P. Balabanov. The yields of rare earth elements by photofission of ²³⁸U. Proceedings of the 42nd Nucl. Spectroscopy and Nucl. Structure Conference at Alma-Ata, Kazakstan (1992) 111 (in Russian).
27. N.P. Balabanov, A.G. Belov, A.P. Tonchev, Yu.P. Gangrsky, F.G. Kondev. Photo-excitation of the ¹⁹⁰Os and ²⁰⁴Pb isomers in the energy region of 8-11 MeV. Proceedings of the 42nd Nucl. Spectroscopy and Nucl. Structure Conference at Alma-Ata, Kazakstan (1992) 248 (in Russian).
28. Yu.P. Gangrsky, A.P. Tonchev, N.P. Balabanov, H.G. Hristov, F.G. Kondev, V.D. Tcholakov. Isomeric yield ratio of ¹³⁴I in the photofission of ²³²Th and ²³⁸U. International Workshop on Dynamical Aspects of Nuclear Fission, Smolenice, CSFR (1991) 17-21.
29. N.P. Balabanov, A.G. Belov, A.P. Tonchev, G. Perez, H.G. Hristov, F.G. Kondev, L.P. Kulkina. Application of the low energy photon spectroscopy in the gamma activation analysis of Au, Hg, Tl, Pb. Proceedings of the 41st Nucl. Spectroscopy and Nucl. Structure Conference at Minsk, USSR (1991) 463 (in Russian).
30. N.P. Balabanov, B. Glaisberg, F.G. Kondev, L.P. Kulkina, A.P. Tonchev, Kh.G. Khristov, and V.D. Cholakov. Gamma Activation Analysis of Rare Earth Elements in Uranium Rocks. Proceedings of the 41st Nucl. Spectroscopy and Nucl. Structure Conference at Minsk, USSR (1991) 462 (in Russian).
31. A.D. Antonov, N.P. Balabanov, Yu.P. Gangrsky, A.P. Tonchev, F.G. Kondev, H.G. Hristov. Cross section measurements of the (g,a) reactions for ⁹⁶Zr, ⁹³Nb, ⁹²Mo nuclei in the Giant Resonance Region. Proceedings of the 41st Nucl. Spectroscopy and Nucl. Structure Conference at Minsk, USSR (1991) 285 (in Russian).
32. A.D. Antonov, N.P. Balabanov, A.G. Belov, F.G. Kondev, G. Peres, H.G. Hristov, A.P. Tonchev. Isomer ratios in (g,n) reactions for the nuclei in range of 70<A<125. Proceedings of the 41st Nucl. Spectroscopy and Nucl. Structure Conference at Minsk, USSR (1991) 286 (in Russian).
33. A.D. Antonov, N.P. Balabanov, Yu.P. Gangrsky, F.G. Kondev, S.G. Marinova, A.P. Tonchev, Kh.G. Khristov, and V.D. Cholakov. Integral Cross Section of (g,a) reactions in the Giant Dipole Resonance Region. Proceedings of the 41st Nucl. Spectroscopy and Nucl. Structure Conference at Minsk, USSR (1991) 284 (in Russian).
34. H.G. Hristov, A.P. Tonchev, N.P. Balabanov, S.G. Marinova, V.D. Tcholakov. Instrumental gamma activation analysis of uranium rocks. The third symposium on nuclear methods application in industry. Plovdiv, Bulgaria (1988) 10-15 (in Russian).