Anile, A.M., et al <br/><br/>
Ray methods for nonlinear waves in fluids & plasmas 
A.M. Anile, et al 
 - New York  Longman  1993 
 - 246 
 - Pitman monographs & surveys in pure & applied mathematics 57 .
<br/><br/><label>ISBN: </label>9780582023437 
<br/><br/><label>Dewey Class. No.: </label>6.04+14.03  / ANIL