(NoDNOMERNYE DWUHFAZNYE TE^ENIQ (B:s ((NiERARHIQ OPISANIJ(B) /s - (NmAURIN(B, (NlEW nIKOLOAEWI^s ((NmOSKWA (B:s (NiZD(B-(NWO mOSK(B. (NUN(B-(NTA(B,s, 1989)
(NbIBLIOGR(B.: (NS(B. 77-81s
Keywords: (NgAZOVIDKOSTNYE SMESIs -- (NdWIVENIE PO TRUBAMs -- (NmATEMATI^ESKIE ISSLEDOWANIQs