El'sgol'ts L E <br/><br/>
Differential  equations. 
El'sgol'ts L E 
 -  1961 
<br/><br/><label>Standard No.: </label>125920 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Dewey Class. No.: </label>B33, K1