Ritger, P. D. and Rose, N. J. <br/><br/>
Differential equations with applications   

 - New York  McGraw-Hill  1968 
 - xiv, 545p. 
 - International series in Pure and Applied Mathematics .
<br/><br/>  
<br/><br/><label>Dewey Class. No.: </label>515.35  / R611.DE