Voir la notice de l'article provenant de la source Numdam
@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}, pages = {329--352}, publisher = {Martinus Nijhoff Publishers}, volume = {64}, number = {3}, year = {1987}, mrnumber = {918416}, zbl = {0656.17006}, language = {en}, url = {http://geodesic.mathdoc.fr/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://geodesic.mathdoc.fr/item/CM_1987__64_3_329_0/