Zill, Dennis G. <br/><br/>
A first course in differential equations with applications / 
Dennis G. Zill 
 - 4th ed. 
 - Boston  :  PWS-KENT Pub. Co,  1979 
 - xii, 540 p.  :  ill.  ;  24 cm. 
<br/><br/><label>ISBN: </label>053491568X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Differential equations