@article{PORMA_1971__30_2_115144,
     author = {Smith, John M.},
     title = {On the existence of certain matrices},
     journal = {Portugaliae mathematica},
     pages = {93--95},
     publisher = {mathdoc},
     volume = {30},
     number = {2},
     year = {1971},
     mrnumber = {0308147},
     zbl = {0225.15016},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1971__30_2_115144/}
}