%0 Journal Article %A E.M. Opdam %T An analogue of the Gauss summation formula for hypergeometric functions related to root systems. %J Mathematische Zeitschrift %D 1993 %P 311-336 %V 212 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/MZ_1993__212_4_174490/ %F MZ_1993__212_4_174490