Gunther, Paul <br/><br/>
Huygen's principle and hyperbolic equations / 

 - Boston :  Academic Press ,  1988. 
 - vii+847  23.5cms 
 - Perspectives in mathematics;v5^J Coats and S Helgason .
<br/><br/><label>Subjects--Index Terms: </label>Differential And Integral Equations Mathematics