Rouche, N & Mawhin, J <br/><br/>
Ordinary differential equations  stability & periodic solutions 
N. Rouche & J. Mawhin 
 - Boston  Pitman Advanced Publishing Program  1980 
 - ix  260 
 - Surveys & reference works in mathematics .
<br/><br/><label>Dewey Class. No.: </label>10.01  / ROUC