(NsOWREMENNYE PROBLEMY MATEMATIKIs (NSBORNIK (B: (NPER(B. (NS ANGL(B.s - (NkIRO(B,(Ns(B. (Nn(B.s (NsERGEJ nIKOLAEWI^s ((Nm(B.s (NzNANIEs, 1980)