Differential equations : 
Hubbard, John H. 
 - Corr. 3rd print. 
 - New York :  Springer,  1997 
 - xiii,350 p.;  ill. ;  25 cm. 
 - Texts in applied mathematics ;  5- .
<br/><br/><label>ISBN: </label>0387972862 (pt. 1)