MINING UNIT BASE BEAM - STEPANOVICH GENNADIJ YA,SU; IVANOV IVAN I,SU; IVANOV IVAN F,SU; OLEJNIKOV OLEG V,SU; YAROSHEVICH ANATOLIJ N,SU; DUDCHENKO NIKOLAJ I,SU; MOSKALENKO ANATOLIJ G,SU; KRUTKO SERGEJ G,SU (1989)