BIRKHOFF, Garrett <br/><br/>
Ordinary Differential Equations  

 - 4th 
 - New York  John Wiley and Sons  1989 
 - xi, 399p. 
<br/><br/><label>ISBN: </label>0471500208 
<br/><br/><label>LC Class. No.: </label>QA372  / .B57