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@article{PORMA_1949__8_4_114681, author = {Gi\~ao, Ant\'onio}, title = {On the origin of positive and negative electricity}, journal = {Portugaliae mathematica}, pages = {143--153}, publisher = {mathdoc}, volume = {8}, number = {4}, year = {1949}, mrnumber = {0044946}, zbl = {0040.27901}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1949__8_4_114681/} }
Gião, António. On the origin of positive and negative electricity. Portugaliae mathematica, Tome 8 (1949) no. 4, pp. 143-153. http://geodesic.mathdoc.fr/item/PORMA_1949__8_4_114681/