Pennisi, Louis L. <br/><br/>
Elements of ordinary differential equations. 
Louis L. Pennisi 
 - New York:  Holt, Rinehart and Winston, Inc.  1972. 
 - xiii,767 p. 
<br/><br/>Includes index. 
<br/><br/><label>ISBN: </label>0-03-078950-8 
<br/><br/><label>Dewey Class. No.: </label>515.3 PEE