CRC handbook of lie group analysis of differential equations.V.2   
ed by N. H. Ibragimov, etal. 
 - Boca Raton  CRC press  1995 
 - xix, 546p. 
<br/><br/><label>ISBN: </label>0849328640 
<br/><br/><label>Dewey Class. No.: </label>515.35  / N944.2