Elsgolts, L <br/><br/>
Differential equations and calculus of variations 
L. Elsgolts                                                  
 - Moscow  MIR Publishers  1973 
 - xii,146p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Calculus of variations<br/>Differential equations
<br/><br/><label>Universal Decimal Class. No.: </label>517.9  / ELS