Voir la notice de l'article provenant de la source Czech Digital Mathematics Library
@article{MASLO_1978__28_2_a3, author = {Porubsk\'y, \v{S}tefan}, title = {On covering systems on rings}, journal = {Mathematica slovaca}, pages = {147--152}, publisher = {mathdoc}, volume = {28}, number = {2}, year = {1978}, mrnumber = {526852}, zbl = {0375.13001}, language = {en}, url = {http://geodesic.mathdoc.fr/item/MASLO_1978__28_2_a3/} }
Porubský, Štefan. On covering systems on rings. Mathematica slovaca, Tome 28 (1978) no. 2, pp. 147-152. http://geodesic.mathdoc.fr/item/MASLO_1978__28_2_a3/