@article{2339, author = {Utz, W.R.}, title = {Some theorems and questions on matrices}, journal = {Portugaliae mathematica}, volume = {18}, year = {1959}, pages = {225-229}, zbl = {0097.00602}, mrnumber = {0126453}, language = {en}, url = {http://dml.mathdoc.fr/item/2339} }
Utz, W.R. Some theorems and questions on matrices. Portugaliae mathematica, Tome 18 (1959) pp. 225-229. http://gdmltest.u-ga.fr/item/2339/