Differential equations : a systems approach 
Goldberg, Jack. 
 -  Prentice-Hall, Inc.  1998 
 - xvii, 476 pages. 
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<br/><br/><label>ISBN: </label>0-13-752080-8 
<br/><br/><label>Dewey Class. No.: </label>515.35 G56d 1998