by TONEV,TONCHO P, MARINOV,MARIN P, CVETKOV,KRUM K
Year of Publication 16.01.1984

by TONEV,TONCHO P, CVETKOV,KRUM K, POPOV,DIMITR K, FILIPOV,PETKO A, PETKOV,IVAN G
Year of Publication 14.09.1984

by TONEV,TONCHO P, CVETKOV,KRUM K
Year of Publication 15.11.1983

by PASKOV,KHARALAMPI N, TONEV,TONCHO P, CVETKOV,KRUM K, DUSHANOV,IVAN D, MINTOV,MIKHAIL G, FILIPOV,PETKO A, PETKOV,IVAN G
Year of Publication 15.11.1983