Sanders, J. A. <br/><br/>
Averaging methods in nonlinear dynamical systems / 
J.A. Sanders, F. Verhulst. 
 - New York :  Springer-Verlag,  c1985. 
 - x, 247 p. : 
<br/><br/><label>ISBN: </label>0387962298 (pbk.) : 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Differential equations, Nonlinear
<br/><br/><label>Dewey Class. No.: </label>515.352  / Av