Ėlʹsgolʹt͡s, L. Ė. <br/><br/>
Differential equations and the calculus of variations 
[by] L. Elsgolts. Translated from the Russian by George Yankovsky. 
 - Moscow,  Mir Publishers,  ©1970. 
 - 440 pages :  22 cm. 
<br/><br/> Translation of Different͡sialʹnye uravnenii͡a i variat͡sionnoe ischislenie. 
<br/><br/>Bibliography: p. [436] 
<br/><br/><label>LCCN: </label>72877360  
<br/><br/><label>Nat. Bib. No.: </label>USSR71-5655 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Differential equations.<br/>Calculus of variations.
<br/><br/><label>Dewey Class. No.: </label>515.35  / ELS-D