Elementary differential equations 
Rainville, Earl D. 
 -  Macmillan Publishing Co., Inc.  1981 
 - xiv, 529 pages. 
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<br/><br/><label>Subjects--Topical Terms: </label><br/>Differential equations.
<br/><br/><label>Dewey Class. No.: </label>515.35 R13e 1981