Bluman, George W. <br/><br/>
Symmetries and differential equations   
by George W. Bluman and Sukeyuki Kumei. 
 - New York  Springer-verlag  1989 
 - xiii, 412p. 
 - Applied mathematical sciences  v.81 .
<br/><br/><label>ISBN: </label>0387969969 
<br/><br/><label>Dewey Class. No.: </label>515.35  / N894