Elsgolts, L <br/><br/>
Differential equations and calculus of variations 

 -  Mir Publishers, Moscow  1980 
 - 440 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Differential equations; Analysis; Mathematics
<br/><br/><label>Dewey Class. No.: </label>515.35  ELS-D