by KANNIKE ARNO A,SU, SUURKUUSK ARNO R,SU, BALAKINA LYUDMILA V,SU
Year of Publication 15.10.1980

by KANNIKE ARNO A,SU, ALAPERT ANTS A,SU, RAUDMAN RALF YA,SU, ROOP VALVE KH,SU, YARVEPERA AADU YU,SU
Year of Publication 07.09.1982