00784nam0-22002891i-450-99000088397040332120001010000088397FED01000088397(Aleph)000088397FED0100008839720001010d--------km-y0itay50------baitay-------001yyNonlinear Oscillations in Physical SystemsNew YorkMcGraw-Hill1964.p.392ill.cm 23Dinamica , SismicaHayashi,Chihiro21407ITUNINARICAUNIMARCBK99000088397040332103 D.0,101549IINTCIINTCNonlinear oscillations in physical systems126544UNINAING01