Search for 'au:Helgason, Sigurdur. | Helgason,Sigurdur'

Groups and geometric analysis: integral geometry invariant differential operators and spherical functions /

By Helgason, Sigurdur.. New York : Academic Press Inc , 1984 . xiv,390p ;

By Helgason, Sigurdur.. Providence: American Mathematical Society, 2010 . xxvi, 641p.

By Helgason, Sigurdur. | Helgason,Sigurdur. Providence: 2008 . xvii, 637p.

By Helgason, Sigurdur. | Helgason,Sigurdur. Providence: 2008 . xvii, 637p.