TY - BOOK AU - Helgason,Sigurdur TI - Groups and geometric analysis: integral geometry, in variant differential operators, and spherical functions T2 - Mathematical surveys and monographs, SN - 0-8218-2673-5 AV - QA387 H443 1984 PY - 1984/// CY - Providence, Rhode Island PB - American Mathematical Society KW - Grupos de Lie KW - GeometrĂ­a diferencial ER -