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