(NiZBRANNYE TRUDY (B:s (NmATEMATIKA(B, (NMEHANIKA (B/s - (NqNENKO(B, (NnIKOLAJ nIKOLAEWI^s; (NiNSTITUT TEORETI^ESKOJ I PRIKLADNOJ MEHANIKI so an sssrs ((NmOSKWA (B:s (NnAUKA(B,s, 1991)
Keywords: (NmATEMATIKAs; (NmEHANIKAs