Dumortier, Freddy <br/><br/>
Qualitative theory of planar differential systems 
Freddy Dumortier, Jaume Llibre and Joan C. Artés 
 - New York  Springer  2006 
 - xvi,298p.;   24cm. 
 - Universitext .
<br/><br/><label>ISBN: </label>3-540-32893-9 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Differential equations, Ordinary-Qualitative theory
<br/><br/><label>Dewey Class. No.: </label>515.352  / DUM