(NaSIMPTOTI^ESKIE METODY W TEORII NELINEJNYH KOLEBANIJs - (NbOGOL@BOW(B,(Nn(B. (Nn(B.s (NnIKOLAJ nIKOLAEWI^s; (NmITROPOLXSKIJ(B,(N`(B. (Na(B.s (N`RIJ aLEKSEEWI^s ((Nm(B.s (NnAUKAs, 1974)
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Keywords: (NkOLEBANIQ NELINEJNYEs -- (NrAS^ETs