%0 Journal Article %A W. EICHHORN %T Functional Equations in Vector Spaces, Composition Algebras and Systems of Partial Differential Equations (Short Communication) %J Aequationes mathematicae %D 1969 %P 130-132 %V 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/AM2_1969__2_182315/ %F AM2_1969__2_182315