(NsOWREMENNYE PROBLEMY MATEMATIKI (B:s (NsBORNIK (B/s - (NkIRO(B, (Na(B.(Ns(B.s ((NmOSKWA (B:s (NzNANIE(B,s, 1980)
(NbIBLIOGR(B.: (NS(B. 60-63s
Keywords: (NmATEMATIKA (B- (NsBORNIKIs