Ortega, James M.,  1932- <br/><br/>
An introduction to numerical methods for differential equations / 
James M. Ortega, William G. Poole, Jr. 
 - Marshfield, Mass. :  Pitman Pub.,  c1981. 
 - ix, 329 p. :  ill. ;  25 cm. 
<br/><br/><label>ISBN: </label>0273016377 :  $24.95 
<br/><br/><label>Dewey Class. No.: </label>515 Or83