Zill, Dennis G.,  <br/><br/>
Differential equations with boundary-value problems / Dennis G. Zill, Michael R. Cullen.- 3rd ed. 

 - 3rd ed. 
 - Boston : PWS-KENT, c1993. 
<br/><br/><label>ISBN: </label>0534931588 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Differential equations.
<br/><br/><label>Dewey Class. No.: </label>515.35 ZIL