Elsgolc, Lev Ernestovich. <br/><br/>
Calculus of variations / 
by Lev Ernestovich  Elsgolts. 
 - Oxford  ;  New York :  Pergamon Press Ltd   ,  c1961 ; 1962 
 - 178 p. :  ill. ;  23 cm. 
 - International series of monographs on pure and applied mathematics ;  v. 19 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Calculus of variations.
<br/><br/><label>Dewey Class. No.: </label>517.4 ELS 515