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