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@article{PORMA_1973__32_2_115195, author = {Wilbur, John}, title = {A class of {Caratheodory} outer measures in topological spaces}, journal = {Portugaliae mathematica}, pages = {101--108}, publisher = {mathdoc}, volume = {32}, number = {2}, year = {1973}, mrnumber = {0322125}, zbl = {0252.28001}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1973__32_2_115195/} }
Wilbur, John. A class of Caratheodory outer measures in topological spaces. Portugaliae mathematica, Tome 32 (1973) no. 2, pp. 101-108. http://geodesic.mathdoc.fr/item/PORMA_1973__32_2_115195/