by PISKOPPEL LEONID R,SU, CHUPRAKOV YURIJ I,SU, KALKIS IONAS K,SU, KRUGLOV ALEKSANDR I,SU
Year of Publication 07.01.1988

by PISKOPPEL LEONID R,SU, SERGEEV BORIS B,SU, OSINOVSKIJ ALEKSANDR L,SU, SAVELEV YURIJ F,SU, NIKOLAEV VIKTOR A,SU, KALKIS IONAS K,SU
Year of Publication 07.03.1992