The Binet-Pexider functional equation for rectangular matrices. K.J. Heuvers; D.S. Moak — 1990 Aequationes mathematicae
On Cauchy differences of all orders. K.J. Heuvers; B.R. Ebanks; C.T. Ng — 1991 Aequationes mathematicae
Sums of weight vectors and sums of semilinear functions. William C. Waterhouse; K.J. Heuvers — 1988 Aequationes mathematicae