Lecture given on recent mathematical methods in nonlinear wave propagation (Italy, 1994) <br/><br/>
Recent mathematical methods in nonlinear wave propagation   
ed. by T Ruggeri 
 - Berlin  Springer  1996 
 - 142p. 
 - Lecture notes in mathematics  No.1640 .
<br/><br/><label>ISBN: </label>3540619070 
<br/><br/><label>Dewey Class. No.: </label>530.14  / N961