Blumen, George W. and Kumei, Sukeyuki <br/><br/>
Symmetries and differential equations   

 - New York  Springer-Verlag  1989 
 - xiii, 412p. Index 
 - Applied Mathematical Sciences    v. 81 .
<br/><br/>  
<br/><br/><label>Dewey Class. No.: </label>515.35  / B658.SD