@article{MAN_1957__134_160589,
     author = {S.K. Stein},
     title = {Unions of {Arithmetic} {Sequences.}},
     journal = {Mathematische Annalen},
     pages = {289--294},
     publisher = {mathdoc},
     volume = {134},
     year = {1957},
     zbl = {0084.04302},
     url = {http://geodesic.mathdoc.fr/item/MAN_1957__134_160589/}
}