Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{PORMA_1940__1_4_114566, author = {Mira Fernandes, A. de}, title = {Um teorema de multiplica\c{c}\~ao}, journal = {Portugaliae mathematica}, pages = {340--342}, publisher = {mathdoc}, volume = {1}, number = {4}, year = {1940}, mrnumber = {0002923}, zbl = {0023.30903}, language = {pt}, url = {http://geodesic.mathdoc.fr/item/PORMA_1940__1_4_114566/} }
Mira Fernandes, A. de. Um teorema de multiplicação. Portugaliae mathematica, Tome 1 (1940) no. 4, pp. 340-342. http://geodesic.mathdoc.fr/item/PORMA_1940__1_4_114566/