by KHRISTOVA,IRENA G.,BG
Year of Publication 15.05.1989

by MARKOV, LJUBEN I, KISAOV, VESELIN D, KHRISTOVA, IRENA G, BORSHUKOV, DOBRIN G, MILANOVA, TONJA G, KALCHEV, STOJAN V
Year of Publication 15.10.1990

by BARBUTOV,VENELIN G.,BG, TURLAKOV,KHRISTO A.,BG, BORSHUKOV,DOBRIN G.,BG, KHRISTOVA,IRENA G.,BG, KOKALICHEV,NIKOLAJJ K.,BG
Year of Publication 15.03.1989

by SEMERDZHIEV,ATANAS KH, GEORGIEVA,ADRIANA R, SAVOV,GRIGOR G, KHRISTOVA,IRENA G, NEJJCHEV,SLAVEJJKO K, RAJJCHEV,RUMEN M, ALEKSANDROV,ALEKSANDR L, FILOV,KAMEN V, TODOROV,DIMITR T, MAZGALOVA,ZORNICA G, MOROZOV,JULIJJ N, PEEV,RUMEN M
Year of Publication 14.06.1985

by SHUSHKOV,NIKOLAJJ S, GEORGIEVA,ADRIANA R, TOSHEV,KOCE P, MIRCHEV,IVAN T, KHRISTOVA,IRENA G, TRENKOV,JJORDAN KH, NIKOLOVA,NIKOLINA D, PETKOV,RANGEL N, KISOVA,TODORKA K, ZLATARSKI,IVAN V
Year of Publication 15.02.1985