Voir la notice de l'article provenant de la source Czech Digital Mathematics Library
@article{MASLO_2002__52_3_a3, author = {Mi\v{s}{\'\i}k, Ladislav}, title = {Sets of positive integers with prescribed values of densities}, journal = {Mathematica slovaca}, pages = {289--296}, publisher = {mathdoc}, volume = {52}, number = {3}, year = {2002}, mrnumber = {1936334}, zbl = {1005.11004}, language = {en}, url = {http://geodesic.mathdoc.fr/item/MASLO_2002__52_3_a3/} }
Mišík, Ladislav. Sets of positive integers with prescribed values of densities. Mathematica slovaca, Tome 52 (2002) no. 3, pp. 289-296. http://geodesic.mathdoc.fr/item/MASLO_2002__52_3_a3/