Functional equations which caracterize n-forms and homogeneous functions of degree n. (Short Communication). Konrad J. Heuvers — 1980 Aequationes mathematicae
Functional equations which caracterize n-forms and homogeneous functions of degree n. Konrad J. Heuvers — 1981 Aequationes mathematicae
Matrix solutions of the functional equation of the gamma function. Konrad J. Heuvers; Daniel Moak — 1987 Aequationes mathematicae