00821nam0-22002771i-450-990001279270403321000127927FED01000127927(Aleph)000127927FED0100012792720000920d1985----km-y0itay50------baengAveraging methods in nonlinear dynamical systemsby Sanders & VerhulstNew York [etc.]Springer-Verlag1985Applied mathematical sciences, 59Sanders,Jan Anton58414Verhulst,Ferdinand<1939- >ITUNINARICAUNIMARCBK990001279270403321C-33-(591806MA1MA1Averaging methods in nonlinear dynamical systems113868UNINAING01