Lakshmikantham, V. <br/><br/>
Practical stability of nonlinear systems / 
V. Lakshmikantham, S. Leela, A.A. Martynyuk. 
 - Singapore :  World Scientific,  c1990. 
 - viii, 207 p. 
<br/><br/><label>ISBN: </label>9810203519 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Control theory.<br/>Differential equations.<br/>Liapunov functions.<br/>Stability.