by KIKAS VERNER KH,SU, KHAJN ARTUR A,SU, LAUL ILMAR A,SU, PIKSARV EVALD ,SU
Year of Publication 25.03.1979

by KIKAS VERNER KH,SU, KHAJN ARTUR A,SU, RAADO LEMBI V,SU, LAUL ILMAR A,SU, PIKSARV EVALD ,SU
Year of Publication 23.01.1981

by JYGI OLEV A,SU, KIKAS VERNER KH,SU, PIKSARV EVALD I,SU, KHAJN ARTUR A,SU, FOMENKO VASILIJ M,SU, SEMENOV ANDREJ N,SU, GRABKO STELLIAN I,SU, ZHIVCHIKOV FEDOR P,SU
Year of Publication 07.12.1981