Wen, Frederick Y.M. <br/><br/>
Introduction to the calculus of variation and its applications   
by Frederick Y.M. Wan 
 - New York  Chapman & Hall  1995 
 - xviii, 638p. 
<br/><br/><label>ISBN: </label>0412051419 
<br/><br/><label>Dewey Class. No.: </label>515.64  / N95