Voir la notice de l'article provenant de la source Czech Digital Mathematics Library
@article{MASLO_1994__44_2_a5, author = {Porubsk\'y, \v{S}tefan}, title = {Identities involving covering systems. {I.}}, journal = {Mathematica slovaca}, pages = {153--162}, publisher = {mathdoc}, volume = {44}, number = {2}, year = {1994}, mrnumber = {1282532}, zbl = {0809.11012}, language = {en}, url = {http://geodesic.mathdoc.fr/item/MASLO_1994__44_2_a5/} }
Porubský, Štefan. Identities involving covering systems. I.. Mathematica slovaca, Tome 44 (1994) no. 2, pp. 153-162. http://geodesic.mathdoc.fr/item/MASLO_1994__44_2_a5/