@article{PORMA_1959__18_4_114829,
     author = {Utz, W.R.},
     title = {Some theorems and questions on matrices},
     journal = {Portugaliae mathematica},
     pages = {225--229},
     publisher = {mathdoc},
     volume = {18},
     number = {4},
     year = {1959},
     mrnumber = {0126453},
     zbl = {0097.00602},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1959__18_4_114829/}
}