Kelley, Walter G. <br/><br/>
The theory of differential equations :  classical and qualitative / 
Walter Kelley, Allan Peterson 
 - Upper Saddle River, N.J. :  Pearson Prentice Hall,  2004 
 - xi, 413 p. :  ill. ;  24 cm. 
<br/><br/>Includes bibliographical references (p. 405-407) and index 
<br/><br/><label>ISBN: </label>0131020269  RM316.25 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Differential equations