Bernstein Dorothy L <br/><br/>
Existence theorems in partial differential equations 

 -  1950 
 - p.  cm. 
<br/><br/><label>Standard No.: </label>22658 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Dewey Class. No.: </label>B334, J0;1