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@article{PORMA_1951__10_3_114525, author = {Santal\'o, L.A.}, title = {On permanent vector-varieties in n dimensions}, journal = {Portugaliae mathematica}, pages = {125--127}, publisher = {mathdoc}, volume = {10}, number = {3}, year = {1951}, mrnumber = {0046706}, zbl = {0044.40404}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1951__10_3_114525/} }
Santaló, L.A. On permanent vector-varieties in n dimensions. Portugaliae mathematica, Tome 10 (1951) no. 3, pp. 125-127. http://geodesic.mathdoc.fr/item/PORMA_1951__10_3_114525/