Optical and acoustic waves in solids : Modern topics : Varna, 23-30 September, 1982 /

por International School on Condensed Matter Physics (2nd : 1982 : Varna)
Publicado 1983.

Nonlinear phenomena in solids : modern topics : proceedings of the 3rd International School on Condensed Matter Physics, Varna, 21-29 September, 1984 /

por International School on Condensed Matter Physics (3rd : 1984 : Varna, Bulgaria)
Publicado c1985.

Proceedings of the 12th International School on Condensed Matter Physics : contemporary trends in condensed matter physics and technology, 1-6 September 2002, Varna, Bulgaria /

por International School on Condensed Matter Physics (12th : 2002 Sept. 1-6 : Varna, Bulgaria)
Publicado [2003]