Elsgolc, L.E. <br/><br/>
Calculus of variations   
by L.E. Elsgolc 
 - Oxford  Pergamon Press  1961 
 - 178p. 
 - Pure and Applied Mathematics .
<br/><br/><label>LCCN: </label>61-14038 
<br/><br/><label>Dewey Class. No.: </label>515.64  / N61;1