Sagan H <br/><br/>
Introduction to the calculus of the variations 

 -  1969 
 - p.  cm. 
 - International series in pure and applied mathematics .
<br/><br/><label>Standard No.: </label>29697 
<br/><br/><label>Source: </label> Standards 
<br/><br/><label>Dewey Class. No.: </label>B42, K9