Ross, Shepley L. <br/><br/>
Introduction to ordinary differential equations / 
Shepley L. Ross, with the assistance of Shepley L. Ross, II. 
 - 4th ed. 
 - New York :  Wiley,  c1989. 
 - xi, 609 p. :  ill. ;  24 cm. 
<br/><br/> Includes index. 
<br/><br/>Bibliography: p. [558]. 
<br/><br/><label>ISBN: </label>0471098817 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Differential equations.
<br/><br/><label>LC Class. No.: </label>QA372  / .R815 1989 
<br/><br/><label>Dewey Class. No.: </label>515.3/52