Folland, Gerald B. <br/><br/>
Introduction to partial differential equations / 

 - New Jersey:  Princeton University Press,  1976 
 - vi, 349p. 
 - Mathematical notes  17 .
<br/><br/><label>ISBN: </label>9780691043616 
<br/><br/><label>Dewey Class. No.: </label>515.35  / F667.IP