Hyperbolic equations : 

 - Burnt Mill, Harlow, Essex, England : | New York :  Longman Scientific & Technical ; | Wiley,  1987 
 - 286 p. ;  25 cm. 
 - Pitman research notes in mathematics series,  158 .
<br/><br/> English and French. 
<br/><br/><label>ISBN: </label>0470208694 (Wiley : pbk.) | 0582988918 (pbk.)