Ibragimov, Nacl H <br/><br/>
Elementary lic group analysis and ordinary: Differential equations 

 - Chichester  John Wiley & Sons  1999 
 - xviii, 347 p. 
<br/><br/><label>ISBN: </label> RS50 
<br/><br/><label>Dewey Class. No.: </label>515.352 I7E