Ovsiannikov, L. V. <br/><br/>
Group analysis of differential equations 

 - New York:   Academic Press,   1982. 
 - 416 p.:   graf.;  
<br/><br/><label>Subjects--Topical Terms: </label><br/>PARTIAL DIFFERENTIAL EQUATIONS<br/>BOUNDARY LAYERS<br/>PRINCIPIOS DE INVARIANZA <br/>ALGEBRA DE LIE
<br/><br/><label>Universal Decimal Class. No.: </label>02.20