Bifurcation of planar vector fields and Hilbert's sixteenth problem 
Roussarie, Robert H. 
 - Basel ; | Boston :  Birkhäuser,  1998 
 - xvii, 204 p. :  ill. ;  24 cm. 
<br/><br/><label>ISBN: </label>3764359005 (alk. paper) | 0817659005 (alk. paper)