Poluyanov, Leonid V.  <br/><br/>
Group properties of the acoustic differential equation 

 - London   Taylor & Francis   1995 
 - xiv, 151p. 
<br/><br/> Bibliog on p 147-148 
<br/><br/><label>ISBN: </label>0 7484 0280 2 
<br/><br/><label>Universal Decimal Class. No.: </label>517.9:512.54  / POL