Lavrentev M A <br/><br/>
Variational methods 

 -  1963 
 - p.  cm. 
<br/><br/><label>Standard No.: </label>23499 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Dewey Class. No.: </label>B392L84, K3