1. Fourth International Workshop on Algebraic and Combinatorial Coding Theory, Novgorod, Russia, Sept. 1994.
2. First International Workshop on Optimal Codes and Related Topics, Sozopol, Bulgaria, May 1995.
3. Fifth International Workshop on Algebraic and Combinatorial Coding Theory, Sozopol, Bulgaria, June 1996.
4. IEEE International Symposium on Information Theory, Ulm, Germany, June 1997.
5. Second International Workshop on Optimal Codes and Related Topics, Sozopol, Bulgaria, June 1998.
6. Sixth International Workshop on Algebraic and Combinatorial Coding Theory, Pskov, Russia, September 1998.
7. Spring conferences of the Union of the Bulgarian mathematicians, Bulgaria, April 1992, 1995, 1996, 1998.
8. Seventh International Workshop on Algebraic and Combinatorial Coding Theory, Bansko, Bulgaria, June 2000.
9. Third EuroWorkshop on Optimal Codes and Related Topics, Sunny Beach, Bulgaria, June 2001.

10.Eighth International Workshop on Algebraic and Combinatorial Coding Theory, Tsarskoe selo, Russia, September 2002.

11. MASSEE First International Workshop, Borovetz, Bulgaria, September 2003

12. Nineth International Workshop on Algebraic and Combinatorial Coding Theory, Kranevo, Bulgaria, June 2004.
 

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