Ovsianniko, Lev Varilevich. <br/><br/>
Group analysis of differential equations   
by Lev Varilevich Ovsianiko, tr.& ed. by W.F.Ames 
 - New York  Academic Press  1982 
 - xvi, 416p. 
<br/><br/><label>ISBN: </label>0125318011 
<br/><br/><label>Dewey Class. No.: </label>515.35  / N827