by ANDREEV, NIKOLA P, RASHEV, TSOLO V, ANDREEV, CHAVDAR A, SAVOV, GEORGI D, MANCHEV, MANOL D
Year of Publication 15.02.1991

by GEORGIEV, RAJKO B, DOBREV, STEFAN I, ANDREEV, NIKOLA P, RASHEV, TSOLO V, ANDREEV, CHAVDAR A, STOIMENOV, NEDELCHO V, MANASIEV, MANASI V
Year of Publication 15.04.1992

by RASHEV,COLO V.,BG, STOJANOV,ZAKHARI S.,BG, ANDREEV,NIKOLA P.,BG, POPOV,IVAJJLO D.,BG
Year of Publication 15.03.1989

by RASHEV,COLO V, DOBREV,STEFAN I, PETKANCHIN,LJUBOMIR T, ANDREEV,NIKOLA P, BONEV,STOJAN P, NIKOLOV,IVAN D, POPOV,IVAJJLO D, SAVOV,GEORGI D, PEJJCHEV,IVAN M
Year of Publication 16.12.1985

by RASHEV,COLO V.,BG, PETKANCHIN,LJUBOMIR T.,BG, ANDREEV,NIKOLA P.,BG, LAZAROV,NIKOLAJJ D.,BG, POPOV,IVAJJLO D.,BG
Year of Publication 15.02.1989

by ANDREEV,CZAVDAR A, RASHEV,.SOLO V, ANDREEV,NIKOLA P, MANOLOV,VALENTIN K
Year of Publication 12.12.1978

by RASHEV,COLO V, ANDREEV, NIKOLA P, NICOLOV,IVAN D, MARINOV,MARIN I, VANGELOV, JJORDAN D, ILIEV,VASIL T, CHORBOV,ILIJA G
Year of Publication 15.02.1982

by SARIVANOV,LJUBOMIR A, ANDREEV,CZAVDAR A, RASHEV,.SOLO V, PASKALEV,LJUBOMIR V, IVANOV,RANGEL P, ANDREEV,NIKOLA P, NIKOLOV,IVAN D
Year of Publication 12.07.1978