@article{MASLO_1999_49_3_a3,
     author = {Grekos, Georges},
     title = {Densities in disjoint unions},
     journal = {Mathematica slovaca},
     pages = {255--262},
     year = {1999},
     volume = {49},
     number = {3},
     mrnumber = {1728237},
     zbl = {0956.11007},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/MASLO_1999_49_3_a3/}
}