Gelfand, I. M. <br/><br/>
Calculus of variations/ 
I. M. Gelfand and S. V. Fomin. 
 - New York :  Dover,  1963. 
 - vii, 232 p. : 
<br/><br/><label>ISBN: </label>9780486322582 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Calculus of variations.-
<br/><br/><label>Dewey Class. No.: </label>515.64  / Ca