@article{GDZPPN002286211, title = {Unions of Arithmetic Sequences.}, journal = {Mathematische Annalen}, volume = {133}, year = {1957}, pages = {289-294}, zbl = {0084.04302}, url = {http://dml.mathdoc.fr/item/GDZPPN002286211} }
Stein, S.K. Unions of Arithmetic Sequences.. Mathematische Annalen, Tome 133 (1957) pp. 289-294. http://gdmltest.u-ga.fr/item/GDZPPN002286211/