Participation in international congresses and symposia:

• Second International Young Geological Session “ Geological sciences and mineral resources.”- Sofia, Bulgaria, 27-30 October, 1987.
• XIV Congres Carpatho-Balkan Geological Association (Sofia, 1989)
• First Latin American Conodont Symposium. Lacon I. IGCP Project 271. South American Paleozoic Conodontology. Academia Nacional de Ciencias Cordoba- Argentina, (August-September 1990).
• International Geological Correlation Program. IGCP Project 351 Early Paleozoic Evolution in NW Gondwana. Third International Meeting., Turkey, (Ankara, November 5-11, 1995,).
• VI Congress of Bulgarian Geological Society “News in the geology of Bulgaria, (Sofia, 24-25 October, 1996).
• Second National Geophysical Conference, Bulgaria (Sofia, 21 -23 October 1998).
• ECOS VII, Seventh International Conodont Symposium held in Europe, Italy (Bologna-Modena, June 24-26, 1998).
• XIV International Congress on Carboniferous and Permian at the University of Calgary, Alberta, Canada, (17-21 August, 1999).
• VII International meeting of IGCP Project 421; First Iberian Paleontological Congress;, Evora, Portugal (12-14 October, 2000).
• VII congress of Bulgarian Geological Society held in Sofia - October 2000.
• 5th International Symposium on Eastern Mediterranean Geology Thessaloniki, Greece, 14-20 April 2004.
• Avalonia Moesia Symposium and workshop on the Early Palaeozoic orogens of the Trans-European Suture Zone 9-11 oct.’04 held in Ghent/Ronse Belgium.