Voir la notice de l'article provenant de la source Czech Digital Mathematics Library
@article{MASLO_1967__17_1_a5, author = {Rie\v{c}an, Beloslav}, title = {Lebesgue {Density} {Theorem} in {Topological} {Spaces}}, journal = {Mathematica slovaca}, pages = {55--58}, publisher = {mathdoc}, volume = {17}, number = {1}, year = {1967}, mrnumber = {0213500}, zbl = {0166.06002}, language = {en}, url = {http://geodesic.mathdoc.fr/item/MASLO_1967__17_1_a5/} }
Riečan, Beloslav. Lebesgue Density Theorem in Topological Spaces. Mathematica slovaca, Tome 17 (1967) no. 1, pp. 55-58. http://geodesic.mathdoc.fr/item/MASLO_1967__17_1_a5/