%0 Journal Article %A Joseph Valentine %T On criteria of Blumenthal for inner-product spaces %J Fundamenta Mathematicae %D 1971 %P 265-269 %V 72 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/fm-72-3-265-269/ %R 10.4064/fm-72-3-265-269 %G en %F 10_4064_fm_72_3_265_269