Bluman, George W. <br/><br/>
Symmetries and differential equations / 
George W. Bluman, S. Kumei, G. W. Bluman. 
 - 2nd ed. 
 - [S.l.] :  Springer,  1989. 
 - 432 p. ;  25 cm. 
 - Applied mathematical sciences. .
 - Applied mathematical sciences. .
<br/><br/><label>ISBN: </label>0387969969 9780387969961 
<br/><br/><label>Dewey Class. No.: </label>515.35