Roussarie, Robert H. <br/><br/>
Bifurcations of planar vector fields and Hilbert's 16th problem. 

 - [1st ed.] 
 - Rio de Janeiro:  IMPA,  1995. 
 - 252 p. 
 - Annals of the New York Academy of Sciences,  0077-8923 .
<br/><br/><label>Dewey Class. No.: </label>515.392  / R864b