Saff, E.B ,Nagle, R.K <br/><br/>
Fundamentals of differential equations 

 - 4TH 
 - NEWYORK  ADDISON - WESLEY  1996 
 - 657P 
<br/><br/><label>ISBN: </label>0-201-80875-7 
<br/><br/><label>Dewey Class. No.: </label>515.35 NAG'F