@article{PORMA_1941__2_1_114570,
     author = {Ribeiro, Hugo},
     title = {Caract\'erisations des espaces r\'eguliers normaux et compl\`etement normaux an moyen de l'op\'eration de d\'erivation},
     journal = {Portugaliae mathematica},
     pages = {13--19},
     publisher = {mathdoc},
     volume = {2},
     number = {1},
     year = {1941},
     mrnumber = {0004751},
     zbl = {0024.36303},
     language = {fr},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1941__2_1_114570/}
}