%0 Journal Article %A J. ACZÉL %T On a Functional Equation of the Theory of Curves in Two Dimensional Conformal Geometry %J Aequationes mathematicae %D 1971 %P 246-248 %V 7 %I mathdoc %U http://geodesic.mathdoc.fr/item/AM2_1971__7_136258/ %F AM2_1971__7_136258