Zill, Dennis G. <br/><br/>
A first course in differential equations / 
by Dennis G. Zill. 
 - 5th ed. 
 - Boston :  PWS-Kent,  c1992. 
 - xiv, 541 p. 
<br/><br/> Includes index. 
<br/><br/><label>ISBN: </label>0534931545 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Differential equations.