Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{PORMA_1967__26_1_115001, author = {Nadler, Sam B. jr.}, title = {Coverings by closed sets}, journal = {Portugaliae mathematica}, pages = {51--61}, publisher = {mathdoc}, volume = {26}, number = {1}, year = {1967}, mrnumber = {0248747}, zbl = {0186.56103}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1967__26_1_115001/} }
Nadler, Sam B. jr. Coverings by closed sets. Portugaliae mathematica, Tome 26 (1967) no. 1, pp. 51-61. http://geodesic.mathdoc.fr/item/PORMA_1967__26_1_115001/