Birkhoff Garrett <br/><br/>
Ordinary differential equations 

 - 4 
 - New York  John Wiley          1989 
 - xi,399p  cm. 
<br/><br/> Bibliography P 392-394 
<br/><br/><label>Source: </label> General Book 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Equations
<br/><br/><label>Dewey Class. No.: </label>B331, M9