Jürgen Groß, Götz Trenkler, S.-O. Troschke, William F. Trench, David Callan, Grace Wahba, Robin J. Chapman, Luz M. DeAlba, John H. Lindsey II. A Property of Some Normal Matrices: 10645. The American Mathematical Monthly, 107(2):179-180, 2000. [doi]
Abstract is missing.