Sommerfeld Arnold <br/><br/>
Partial differential equations in physics 

 -  1957 
 - p.  cm. 
<br/><br/><label>Standard No.: </label>23279 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Dewey Class. No.: </label>B3340C, J7-;1