Hellwig Gunter <br/><br/>
Partial differetial eautions : An introduction 

 -  1960 
 - p.  cm. 
<br/><br/><label>Standard No.: </label>22679 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Dewey Class. No.: </label>B334, K01