1. Vienna, Austria, 1980
А. S. Strezov, M. Kh. Mikhailov, V. Ts. Mikhailova, M. I. Taskaeva.Regularity in the changes of the thermodynamic functions associated with the formation of mononuclear complexes.
International Symposium "Thermodynamics of Nuclear Materials" v. II, 75, IAEA
2. Elat, Israel, April 1983
R. Lundqvist and A. Strezov, Pyrocatocholate Complexing of Trivalent Actinides.
13emes Journees des actinides
3. Davos, Switzerland, April 1984
A. S. Strezov and R. Lundqvist, Actinide Complex Formation with Biologically Important Ligands,
14emes Journees des actinides
4. Sofia, Bulgaria, July 1987
A. S. Strezov, Coordination chemistry of actinide hydroquinones and amino acid complexes.
31 International Congress of Pure & Applied Chemistry
5. Brussels, Belgium, May 1993
T. Conboy, J. Espejo, F. Popp, A. Redon, A. Strezov, A Report on a PHARE MISSION to BULGARIA for the Commission of the EUROPEAN COUNTRIES during April 1993 for the Commission of European Communities – "Management of Irradiated Fuel Cycle and Waste Management Policy in Bulgaria
PHARE MISSION under Contract DG1/N ZZ93.01/01.01/B4022 with Commission of European Countries, issued by British Nuclear Fuel PLC
6. Athens, Greece, 22-26 June 1994
E. Piperkova, D. Damianov, N. Christova, R. Georiev, A. Strezov, M. Airanov, D.Tzingilev, S. Sergieva. The Role of Whole-Body Scintigraphy and SPECT in the Lung Cancer Staging.,
International Congress for Lung Cancer
7. Vinci, Italy, September 1995
Alexander Strezov, Radioactivity Content of Black Sea Sediments in the Last Five Years,
First International Congress on Ecology
8. Livermore, USА, 7-9 November 1995
A. Strezov, Y. Fotev. Experience in Seized Nuclear Materials in Bulgaria in the Recent Years.
International Seminar Nuclear Smuggling Forensic Analysis
9. Shkorpilovtzi, Bulgaria, 17-31 July 1997
А. Strezov Ecological Impact of Radiation and Its Pathways in Biosphere and Man.
International UNESCO Seminar "THE YOUTH AND MARINE ECOLOGY"
10. Monaco, France, 1998
A. Strezov, T. Stoilova, N. Petkov, M. Hristoskova Technogenic and Natural Radionuclides in Black Sea Sediments and Algae.
International Symposium on Marine Polution, p. 281-282
11. Dijon, France, 14-18 September 1998
Alexander Strezov, Problems and management of radioactive sources and measures against illicit trafficking of nuclear materials in Bulgaria (IAEA-CN-70/36), pp 337 (1998)
Safety of radiation sources and security of radioactive materials Contributed papers, Conference held in Dijon
12. 1998
A. Strezov, T. Stoilova, Plutonium Content in Black Sea Bottom Sediments and Algae.
NATO ASI Series “Actinides and the Environment”, vol. 41, p. 455-462,
13. Vienna, Austria – 8-9 June 2000
A. Strezov, Recent Cases of Illicit Traffic of Nuclear Materials in Bulgaria Sixth Meeting of the International Technical Working Group (ITWG)
Proceedings p. 9-11
14. Karlsrure, Germany, November 2000
A. Strezov, Model Action Plan for Bulgaria in Respect of Recent Experience of Illicit Trafficking Cases in Bulgaria,
PECO Conference on Combating Illicit Trafficking of Nuclear Materials, Proceedings p.15-19
15. Vienna Austria, November 2001
A. Strezov, On Site Characterization of Illicit Trafficking Samples in Bulgaria. IAEA Regional Technical Cooperation Project RER/9/060
Coordination Meeting of Law Enforcement Services and Radioanalytical Laboratories on Combating Illicit Trafficking of Nuclear and/or Radioactive Materials
16. Salzburg, Austria, September 2002
Alexander Strezov, Measures for Prevention Illicit Trafficking of Nuclear and Radioactive Materials, Symposium on International Safeguards: Verification and Nuclear Material Security
17. Karlsruhe Germany, November 2002
Alexander Strezov, Role of Proper Response Schemes, Legislation and Regional Cooperation in Combating Illicit Trafficking of Nuclear Materials in Developing Countries,
IAEA International Conference on Advances in Destructive and Non-Destructive Analysis for Environmental Monitoring & Nuclear Forensics
18. Athens Greece, 27-29 September 2002
A. Strezov, Tz. Nonova, P. Petkov, T. Stoilova, D. Dimitrov, Radionuclide and Heavy Metal Pollution in Black Sea Marine Ecosystems,
1st Scientific EFMS Conference “Oceanographical Aspects for a Sustainable Mediterranean” organized by The Hellenic Oceanographers Association (HOA)
19. Marseilles, France, 18-21 April 2002
A. S. Strezov, Tz. P. Nonova, T. T. Stoilova, P. S. Petkov “Radionuclide & Heavy Metal Content in Marine Ecosystems at the Bulgarian Black Sea Coast”,
CIESM Conference on Mediterranean Mussel watch,
20. Fleurus–Belgium, 10–12 June 2002
A. Strezov, T. Nonova, P. Petkov, T. Stoilova, D. Dimitrov, Present level of Radionuclide contaminants at the Bulgarian Black Sea coast,
International Symposium “In situ Nuclear Metrology as a Tool for Radioecology”, INSINUME 2002
21. Istanbul, Turkey, 14-17 September, 2003
A. Strezov, Tz. Nonova, D. Dimitrov, B. Todorov. Marine Ecology Studies of Radioactive and Heavy Metal Pollution in the Black Sea,
Second Black Sea Basin Conference on Analytical Chemistry (the 2nd BBCAC), Sile
22. Vilnius, Lithuania, September 2004
Alexander Strezov “Model Action Plan and Exercise for Combating Illicit Traffic in Bulgaria”,
WORKSHOP on Combating Illicit Trafficking of Nuclear and/or Radioactive Materials, p. 28-30
23. Monaco, France, 25-29 October 2004
Alexandar S. Strezov and Tzvetana P. Nonova, Monitoring of Radionuclide and Heavy Metals in Sediments and Macrophytes from Black Sea Ecosystems”,
International Conference on Isotopes in Environmental Studies – Aquatic Forum
24. London United Kingdom, 16-18 March 2005
Alexander Strezov, “Bulgarian Framework for Preventing Illicit Traffic of Nuclear Materials and Border Exercise,
International Conference on Nuclear Security Global Direction for the Future
25. Prague, Chech Republic, 6-7 June 2005
Alexander Strezov, Recent Cases in Combating Illicit Traffic Of Radioactive and Nuclear Materials in Bulgaria,
Workshop on Nuclear Forensic Methods – INFL MEETING
26. Prague, Chech Republic, 8-9 June 2005
Alexander Strezov Bulgarian legislation and Border Exercise in combating nuclear terrorism,
Workshop on Nuclear Forensic Methods – ITWG MEETING
27. Bordeaux, France, 27.06–1.07.2005
Alexander Strezov, Evaluation of Bulgarian Needs for Security Protection of Radioactive Sources and Training of Law Enforcement Personnel by Border Exercises,
International Conference on Safety & Security of Radioactive Sources: Towards a Global System for the Continuous Control of Sources throughout their Life Cycle, (2006)
28. Sassari –Sardinia, Italy, 4-6 October 2006
Alexander Strezov, Tzvetana Nonova, Radionuclides and Trace Metals in Macroalgae from Uncontaminated Areas in the Black Sea Coast.
Proc: International Symposium “Monitoring of Mediterranean coastal areas: Problems and Measurement Techniques”, pp. 46-47
29. Istanbul Turkey, April 2007
Alexander Strezov, Tzvetana Nonova, Marine Macroalgae for The Assessment of Radionuclide and Heavy Metal Pollution in the Black Sea,
CIESM 38 Intern. Congress
30. Edinburgh, United Kingdom, 19-22 November 2007
Alexander Strezov, Recent Analysis of Nuclear Smuggling Samples in Bulgaria,
International Conference on “Illicit Nuclear Trafficking: Collective Experience and Way Forward”
31. Umea, Sweden, 25 - 28 June 2007
Alexander Strezov, Red Mercury – Hoax and Reality,
12th Workshop on Nuclear Forensic Methods – International Technical Working Group MEETING
32. Anthalia, Turkey, 22 – 25 May 2009
Alexander. S. Strezov, Measures for Combating Nuclear Terrorism In Bulgaria,
International Workshop on “Combating Illicit Trafficking of Nuclear Materials”