Bluman, George W. <br/><br/>
Symmetries and differential equations.   
by George W Bluman, Sukeyuki Kumei 
 - New York  Springer-Verlag  1989 
 - xiii, 412p 
 - Applied mathematical sciences, Vol.81 .
<br/><br/><label>ISBN: </label>0387969969 
<br/><br/><label>Dewey Class. No.: </label>515.35  / N894;1