Helgason, S <br/><br/>
Groups & geometric analysis  integral geometry, invariant differential operators & spherical functions 
S. Helgason 
 - Orlando  Academic Press  1984 
 - xix  654 
 - Pure & applied mathematics 113 .
<br/><br/><label>ISBN: </label>0123383013 
<br/><br/><label>Dewey Class. No.: </label>8.05+9.02  / HELG