no. 1
Commutativity of intertwining operators for semisimple groups
Compositio Mathematica, Tome 46 (1982) no. 1, pp. 33-84. 
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     title = {Commutativity of intertwining operators for semisimple groups},
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     pages = {33--84},
     publisher = {Martinus Nijhoff Publishers},
     volume = {46},
     number = {1},
     year = {1982},
     mrnumber = {660154},
     zbl = {0488.22027},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1982__46_1_33_0/}
}
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Knapp, A. W. Commutativity of intertwining operators for semisimple groups. Compositio Mathematica, Tome 46 (1982) no. 1, pp. 33-84. http://archive.numdam.org/item/CM_1982__46_1_33_0/

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