Characters of the irreducible highest weight modules over the virasoro and super-virasoro algebras Dobrev, V. K. — 1987 Proceedings of the 14th Winter School on Abstract Analysis
q -difference conformal invariant operators and equations Dobrev, V. K. — 1996 Proceedings of the 15th Winter School "Geometry and Physics"
Singleton representations of U q ( so ( 3 , 2 ) ) Dobrev, V. K.; Moylan, P. — 1997 Proceedings of the 16th Winter School "Geometry and Physics"