Caratheodory <br/><br/>
Calculus of variations and partical differential equations of the first order 

 -  1965 
 - p.  cm. 
<br/><br/><label>Standard No.: </label>29483 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Dewey Class. No.: </label>B 42, K51