The unramified principal series of p-adic groups. II. The Whittaker function
Compositio Mathematica, Tome 41 (1980) no. 2, p. 207-231
@article{CM_1980__41_2_207_0,
     author = {Casselman, William and Shalika, J.},
     title = {The unramified principal series of $p$-adic groups. II. The Whittaker function},
     journal = {Compositio Mathematica},
     publisher = {Sijthoff et Noordhoff International Publishers},
     volume = {41},
     number = {2},
     year = {1980},
     pages = {207-231},
     zbl = {0472.22005},
     mrnumber = {581582},
     language = {en},
     url = {http://www.numdam.org/item/CM_1980__41_2_207_0}
}
Casselman, W.; Shalika, J. The unramified principal series of $p$-adic groups. II. The Whittaker function. Compositio Mathematica, Tome 41 (1980) no. 2, pp. 207-231. http://www.numdam.org/item/CM_1980__41_2_207_0/

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