00622nam0-22002291i-450-990001308130403321000130813FED01000130813(Aleph)000130813FED0100013081320000920d--------km-y0itay50------baengNonlinear autonomus oscillationsAnalytical theoryby URABE M.Urabe,Minoru59263ITUNINARICAUNIMARCBK990001308130403321C-26-(347360MA1MA1Nonlinear autonomus oscillations383605UNINAING01