International Atomic Energy Agency, Vienna (Austria). International Nuclear Data Committee; Gosudarstvennyj Komitet po Ispol'zovaniyu Atomnoj Ehnergii SSSR, Moscow; p. 34; May 1978; p. 34; Paper submitted to ''Izvestiya Akad. Nauk BSSR, Seriya fiziko-ehnergeticheskikh nauk''. Translated from Russian. Published in summary form only.