by VASILEV, SASHO V, KOZHUKHAROV, VLADIMIR S, JORDANOVA, ILINA L, MARINOV, MARIN R
Year of Publication 15.04.1993

by VASILEV, SASHO V, VASILEVA, MARIJANA CH, KOZHUKHAROV, VLADIMIR S, GUGOV, IVAJLO B
Year of Publication 15.11.1991

by KRANOLD, REINER, SAMUNEVA, BISERKA I, TRAPALIS, KHRISTOS KH, VASILEV, SASHO V, KOZHUKHAROV, VLADIMIR S
Year of Publication 15.11.1990

by VASILEV,SASHO V.,BG, JJORDANOVA,ILINA L.,BG, MARINOV,MARIN R.,BG, KOZHUKHAROV,VLADIMIR S.,BG
Year of Publication 14.10.1988