Caratheodory, Constantin <br/><br/>
Calculus of variations and partial differential equations of the first order  / 

 - New York:  Chelsea,  1982 
 - xix, 402p. Index 
<br/><br/> "Translated from the German by Robert B. Dean" 
<br/><br/><label>Dewey Class. No.: </label>515.64  / C262.CV