Vainberg, B R <br/><br/>
Asymptotic Methods in Equation of Mathematical Physics   
by B R Vainberg 
 - New York  GBS Publisher  1989 
 - vii, 498P. 
<br/><br/><label>ISBN: </label>9782881246647 
<br/><br/><label>Dewey Class. No.: </label>515.35  / N8915