Kevorkian, J. <br/><br/>
Perturbation methods in applied mathematics   
by J.Kevorkian, J.D.Cole 
 - New York  Springer-Verlag  1981 
 - x, 558p. 
 - Applied Mathematical Science  34 .
<br/><br/><label>ISBN: </label>0387905073 
<br/><br/><label>Dewey Class. No.: </label>515.35  / N811