no. 2
Base change for unit elements of Hecke algebras
Compositio Mathematica, Tome 60 (1986) no. 2, pp. 237-250. 
@article{CM_1986__60_2_237_0,
     author = {Kottwitz, Robert E.},
     title = {Base change for unit elements of {Hecke} algebras},
     journal = {Compositio Mathematica},
     pages = {237--250},
     publisher = {Martinus Nijhoff Publishers},
     volume = {60},
     number = {2},
     year = {1986},
     mrnumber = {868140},
     language = {en},
     url = {http://www.numdam.org/item/CM_1986__60_2_237_0/}
}
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Kottwitz, Robert E. Base change for unit elements of Hecke algebras. Compositio Mathematica, Tome 60 (1986) no. 2, pp. 237-250. http://www.numdam.org/item/CM_1986__60_2_237_0/

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