Ovsyannikov, L.V., <br/><br/>
Lectures on the theory of group properties of differential equations 

 - New Jersey  World Scientific  2013 
 - xi, 141p. :  ill;  25 cm. 
<br/><br/><label>ISBN: </label>9789814460811 
<br/><br/><label>Dewey Class. No.: </label>515.35 OVS