no. 2
The unramified principal series of p-adic groups. II. The Whittaker function
Compositio Mathematica, Tome 41 (1980) no. 2, pp. 207-231.
partie précédente The unramified principal series of p-adic groups. I. The spherical function 
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     author = {Casselman, W. and Shalika, J.},
     title = {The unramified principal series of $p$-adic groups. {II.} {The} {Whittaker} function},
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     year = {1980},
     mrnumber = {581582},
     zbl = {0472.22005},
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}
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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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