A Set of Matrices whose Inverse have for Elements the Elements of the Original Matrix Divided by the Order of the Matrix
John P. Hoyt · American Mathematical Monthly · 1962
John P. Hoyt, A Set of Matrices whose Inverse have for Elements the Elements of the Original Matrix Divided by the Order of the Matrix, The American Mathematical Monthly, Vol. 69, No. 3 (Mar., 1962), pp. 221-222