Nayfeh, Ali H. <br/><br/>
Method of normal forms 

 - New York  John Wiley  1993 
 - xii,218p, 22cm 
 - Wiley series in nonlinear science .
<br/><br/><label>ISBN: </label>0471593540 
<br/><br/><label>Dewey Class. No.: </label>512.944,  / D, nay