Elsgolts, L . <br/><br/>
Differential Equations and the Caklculus of Variations /  Textual Documents 
L.Elsgolts. 
 - Sl :  Sn ,  1901. 
<br/><br/><label>Subjects--Index Terms: </label>Mah 
<br/><br/><label>Dewey Class. No.: </label>515.3  / E l 76 Di