%0 Journal Article %A Joshi, C.M. %T An operational formula involving the associated ultraspherical polynomials %J Portugaliae mathematica %D 1971 %P 1-9 %V 30 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/PORMA_1971__30_1_115131/ %G en %F PORMA_1971__30_1_115131