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@article{PORMA_1942__3_1_114594, author = {von Neumann, John}, title = {Approximative properties of matrices of high finite order}, journal = {Portugaliae mathematica}, pages = {1--62}, publisher = {mathdoc}, volume = {3}, number = {1}, year = {1942}, mrnumber = {0006137}, zbl = {0026.23302}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1942__3_1_114594/} }
von Neumann, John. Approximative properties of matrices of high finite order. Portugaliae mathematica, Tome 3 (1942) no. 1, pp. 1-62. http://geodesic.mathdoc.fr/item/PORMA_1942__3_1_114594/