Root systems and hypergeometric functions. I
Compositio Mathematica, Tome 64 (1987) no. 3, p. 329-352
@article{CM_1987__64_3_329_0,
     author = {Heckman, G. J. and Opdam, E. M.},
     title = {Root systems and hypergeometric functions. I},
     journal = {Compositio Mathematica},
     publisher = {Martinus Nijhoff Publishers},
     volume = {64},
     number = {3},
     year = {1987},
     pages = {329-352},
     zbl = {0656.17006},
     mrnumber = {918416},
     language = {en},
     url = {http://www.numdam.org/item/CM_1987__64_3_329_0}
}
Heckman, G. J.; Opdam, E. M. Root systems and hypergeometric functions. I. Compositio Mathematica, Tome 64 (1987) no. 3, pp. 329-352. http://www.numdam.org/item/CM_1987__64_3_329_0/

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