Differential equations and dynamical systems  
Perko, Lawrence. 
 - 3rd ed. 
 - New York :  Springer,  2001 
 - xiv, 553 p. :  ill. ;  25 cm. 
 - Texts in applied mathematics ;  7 .
<br/><br/><label>ISBN: </label>0387951164 (alk. paper)