Derrick, William R. <br/><br/>
Elementary differential equations / 
William R. Derrick. 
 - 4th.ed. 
 - Massachusetts :  Addison-Wesley,  c1997. 
 - 404 p. 
<br/><br/><label>ISBN: </label>0673985547 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Differential equations.
<br/><br/><label>LC Class. No.: </label>QA371  / .D4322