by RASHEVA, IVANKA A, VALKOV, LYUDMIL K, STOYANOV, STOYAN M, RASHEV, TZOLO V
Year of Publication 29.03.1988

by VALKOV; LYUDMIL K, RASHEV; TZOLO V, STOYANOV; STOYAN M, RASHEVA; IVANKA A
Year of Publication 26.05.1987

by LAMBEV, YORDAN G, KOSSEV, DANAIL K, RASHEVA, IVANKA A, VALKOV, LYUDMIL K, STOYANOV, STOYAN M, RASHEV, TZOLO V
Year of Publication 24.12.1985

by LAMBEV; YORDAN G, KOSSEV; DANAIL K, VALKOV; LYUDMIL K, RASHEV; TZOLO V, STOYANOV; STOYAN M, RASHEVA; IVANKA A
Year of Publication 09.10.1984