(NoPTIMALXNOSTX W IGRAH I RE[ENIQH (B/s - (NwILKAS(B, (N|DUARDAS jONOs ((NmOSKWA (B:s (NnAUKA(B,s, 1990)
(NbIBLIOGR(B.: (NS(B. 239-250s
Keywords: (NpRINQTIE RE[ENIJs -- (NmATEMATI^ESKAQ TEORIQs; (NtEORIQ IGRs