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 KIS'OV,VESELIN D.,BG, MARKOV,LJUBEN I.,BG, KHADZHIDIMITROV,DIMIT'R I.,BG
Year of Publication 14.04.1989

by KALCHEV,STOJAN V, KISOV,VESELIN D, GEORGIEV,GEORGI L, KOSTOV,MLADEN L, MARKOV,LJUBEN I, KOLEV,KONSTANTIN G, GUZGUNOV,ANTON G, RADOMIROV,RASHKO K
Year of Publication 15.01.1985

by KALCHEV,STOJAN V, KISOV,VESELIN D, GEORGIEV,GEORGI L, KOSTOV,MLADEN L, MARKOV,LJUBEN I, KOLEV,KONSTANTIN G, GUZGUNOV,ANTON G, KHADZHIDIMITROV,DIMITR I, RADOMIROV,RASHKO K
Year of Publication 15.01.1985

by PAUNOV, STOJKO P, MARKOV, LJUBEN I, GEORGIEV, GEORGI A, TENEV, PETAR S, KISAOV, VESELIN D, SHISHKOV, PETAR A, SIMEONOV, LJUBOMIR KH, BONCHEV, PAVEL P, ALEKSIEV, ALEKSI P, STOJANOV, IVAN V, KALCHEV, STOJAN V, MILEV, KHRISTO S
Year of Publication 15.10.1991

by KALCHEV,STOJAN V, KISOV,VESELIN D, GEORGIEV,GEORGI L, GOCHEVA,BISTRA S, CANKOV,LJUBOMIR D, GELEVA,PENKA S, KOSTOV,MLADEN L, MARKOV,LJUBEN I, KOLEV,KONSTANTIN G, GUZGUNOV,ANTON G, RADOMIROV,RASHKO K
Year of Publication 15.08.1985