Ritger, Paul D. <br/><br/>
Differential equations with applications / 
Paul D. Ritger and Nicholas J. Rose 
 - New York :  McGraw-Hill Book,  1968 
 - xiv 545 p. ;  23 cm. 
<br/><br/>References : p. 503-504 Includes index 
<br/><br/><label>ISBN: </label>070529450 
<br/><br/><label>LCCN: </label>67-013202 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Differential equations