John, Fritz. <br/><br/>
Plane Waves and Spherical Means /  

 - 1st ed /  
 - New York :   Springer-Verlag. 
 - p.172 :  
<br/><br/><label>ISBN: </label>0-387-90565-0 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics
<br/><br/><label>Dewey Class. No.: </label>B334  / J5