Ibragimov, Nail H.  _ Kovalev, Vladimir F <br/><br/>
Approximate and renormgroup symmetries  _ 

 - New York  Springer  2009 
 - iii,145p.  HB  24cm. 
 - Nonlinear Physical Science .
<br/><br/> includes bibliographical references and index 
<br/><br/><label>ISBN: </label>9783642002274 
<br/><br/><label>Subjects--Personal Names: </label>   _ 
<br/><br/><label>Dewey Class. No.: </label>621.3694  / IBR