@article{2017, author = {Santal\'o, L.A.}, title = {On permanent vector-varieties in n dimensions}, journal = {Portugaliae mathematica}, volume = {10}, year = {1951}, pages = {125-127}, zbl = {0044.40404}, mrnumber = {0046706}, language = {en}, url = {http://dml.mathdoc.fr/item/2017} }
Santaló, L.A. On permanent vector-varieties in n dimensions. Portugaliae mathematica, Tome 10 (1951) pp. 125-127. http://gdmltest.u-ga.fr/item/2017/