%0 Journal Article %A R.L. Hall %T On Single-Product Functions with Rotational Symmetry. %J Aequationes mathematicae %D 1972 %P 281-286 %V 8 %I mathdoc %U http://geodesic.mathdoc.fr/item/AM2_1972__8_136302/ %F AM2_1972__8_136302