@article{PORMA_1941__2_1_114590,
     author = {Sebasti\~ao e Silva, J.},
     title = {Sur une m\'ethode d'approximation semblable \`a celle de {Gr\"affe}},
     journal = {Portugaliae mathematica},
     pages = {271--279},
     publisher = {mathdoc},
     volume = {2},
     number = {1},
     year = {1941},
     mrnumber = {0005944},
     zbl = {0026.05303},
     language = {fr},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1941__2_1_114590/}
}