%0 Journal Article %A Bloom, Walter R. %A Ressel, Paul %T Positive Definite and Related Functions on Hypergroups %J Canadian journal of mathematics %D 1991 %P 242-254 %V 43 %N 2 %U http://geodesic.mathdoc.fr/articles/10.4153/CJM-1991-013-2/ %R 10.4153/CJM-1991-013-2 %F 10_4153_CJM_1991_013_2