Pentryagin I S <br/><br/>
Ordinary differential equations 
Pentryagin I S 
 -  1962 
 - p.  cm. 
<br/><br/><label>Standard No.: </label>22497 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics
<br/><br/><label>Dewey Class. No.: </label>B331, K22