@article{JRAM_1929__161_149707,
     author = {J. von Neumann},
     title = {Zur {Theorie} der unbeschr\"ankten {Matrizen.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {208--236},
     publisher = {mathdoc},
     volume = {161},
     year = {1929},
     zbl = {55.0825.01},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1929__161_149707/}
}