Elsgolts, L. <br/><br/>
Differential equations and the calculus of variations / 
Elsgolts, L. 
 -  Mir Publishers, Moscow 
 - 440 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics
<br/><br/><label>Dewey Class. No.: </label>515.35  / ELSD