by DALBINYA M.YA.,SU, KLYAVINYA S.YU.,SU, LUZHKOV A.M.,SU, BEKER M.E.,SU, KALNINSH A.YA.,SU, UDROVSKIJ G.A.,SU, LEVANE V.A.,SU, SEDVALD A.K.,SU, BRAKSH N.A.,SU, VIMBA B.YA.,SU
Year of Publication 30.05.1981