Helgason, Sigurdur,  1927- <br/><br/>
Groups and geometric analysis  integral geometry, invariant differential operators, and spherical functions 
Sigurdur Helgason 
 - New York  Academic Press  1984 
 - xix, 654 p.  ill  24 cm. 
 - Pure and applied mathematics  113 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Lie groups<br/>Geometry, Differential
<br/><br/><label>Dewey Class. No.: </label>512  / .55