TY  - JOUR
AU  - Casselman, W.
TI  - The unramified principal series of $p$-adic groups. I. The spherical function
JO  - Compositio Mathematica
PY  - 1980
SP  - 387
EP  - 406
VL  - 40
IS  - 3
PB  - Sijthoff et Noordhoff International Publishers
UR  - http://www.numdam.org/item/CM_1980__40_3_387_0/
LA  - en
ID  - CM_1980__40_3_387_0
ER  -