(NnEOBHODIMYE USLOWIQ \KSTREMUMA (B/s - (Np[ENI^NYJ(B, (NbORIS nIKOLAEWI^s ((NmOSKWA (B:s (NnAUKA(B,s, 1982)
(NbIBLIOGR(B.: (NS(B. 137-138s
Keywords: (NfUNKCII (B((NMAT(B.) s -- (N|KSTREMUMs