by GROZDANOV,VELCHO D, ZAKHARIEV,PETR D, VASILEV,GERASIM C, KOVACHEV,NIKOLA G, KAROV,KALIN V
Year of Publication 14.01.1983

by STOEVA, VESKA V, TSAKOV, METODI P, SKOROPAD, VLADIMIR M, KASHURKO, ALEKSANDR S, KAROV, KALIN V, KHRUSHCHOV, NIKOLAJ A, GEORGIEV, LACHEZAR R, KLEPIKOV, JURIJ B, GROZDANOV, VELCHO D, PETROV, LJUDMIL A, GENOVA, NINA T, SMAKOUZ, GEORGIJ N
Year of Publication 15.08.1991

by STOEVA, VASKA V, IVANOV, GEORGI A, BAKALOVA, BOJANKA I, KHRUSHCHOV, NIKOLAJ A, MALYSHEV, NIKOLAJ N, MINCHEV, KHRISTO I, SKOROPAD, VLADIMIR M, SEREBRJAKOV, IGOR N, KAROV, KALIN V, KLEPIKOV, JURIJ B, NIKOLOV, GEORGI M, GROZDANOV, VELCHO D, PETROV, LJUDMIL A
Year of Publication 15.02.1990

by GROZDANOV,VELCHO D, SBEV,ZHELJAZKO D, BOZHKOV,BOZHIDAR N, GENOVA,NINA T, GRAMADOV,ANDREJJ A, KARALEEV,IVAN S, KAROVA,DOBRINKA G, PELOV,VIKTOR E, TODOROV,MITKO I, MINCHEV,KHRISTO R, BRDAROVA,MARIJA I, KAROV,KALIN V
Year of Publication 15.10.1986

by STOEVA, VASKA V, PAPUCHAROV, PETAR G, IVANOV, GEORGI A, KASHURKO, ALEKSANDR S, VALCHEV, JORDAN B, KHRUSHCHOV, NIKOLAJ A, SMAKOUZ, GEORGIJ N, BOJKOV, DIMITAR T, SKOROPAD, VLADIMIR M, KAROV, KALIN V, CHERNAS, JURI JA, KLEPIKOV, JURIJ B, GROZDANOV, VELCHO D, PETROV, LJUDMIL A
Year of Publication 15.08.1990