Rouche, N., et al <br/><br/>
Stability theory by liapunov's direct method 
N. Rouche, et al 
 - New York  Springer  1977 
 - xii  396 
 - Applied mathematical sciences 22 .
<br/><br/><label>ISBN: </label>3540902589 
<br/><br/><label>Dewey Class. No.: </label>10.01  / ROUC