00463nam a2200109Ia 4500008004100000082002000041100002300061245011400084260003600198300002800234490009100262260907b        |||||||| |||| 00| 0 eng d  a515.24bH474.GG  aHelgason, Sigurdur  aGroups and geometry analysisb; integral geometry, invariant differential operators and spherical functions /  aOrlando:bAcademic Press,c1984  axix, 654p. Index, Bibl.  aPure and Applied Mathematicsv(Academic) a series of monographs and textbooks ; v.113