Nayfeh, Ali Hasan <br/><br/>
Perturbation methods   

 - New York  John Wiley  1973 
 - xii, 425p. Index 
 - Pure and Applied Mathematics .
<br/><br/> "A Wiley Interscience publication"   
<br/><br/><label>Dewey Class. No.: </label>515.73  / N331.PM