1. I.I. KALECHITS, V.P. ZUBOV, M.G. KUZ'MIN, A.I. KUZAYEV and V.A. KABANOV, Manuscript deposited at All-Union Institute of Scientific and Technical Information, Moscow, Dep. No. 3172-81.
2. I.I. KALECHITS, M.G. KUZ'MIN, V.P. ZUBOV and V.A. KABANOV, Manuscript deposited at All-Union Institute of Scientific and Technical Information, Moscow, Dep. No. 3174-81.