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200 1 $aAveraging methods in nonlinear dynamical systems$fJ. A. Sanders, F. Verhulst.
210   $aNew York$cSpringer-Verlag$dcopyr. 1985
215   $aX, 247 p.$cill.$d23 cm
225 1 $aApplied mathematical sciences$v59
610 0 $aEquazioni differenziali non lineari
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