%0 Journal Article %A Harold Ruben %T Variance bounds and orthogonal expansions in Hilbert space with an application to inequalities for gamma functions and ... %J Journal für die reine und angewandte Mathematik %D 1967 %P 147-153 %V 225 %I mathdoc %U http://geodesic.mathdoc.fr/item/JRAM_1967__225_150780/ %F JRAM_1967__225_150780