@article{ADM_2015_20_2_a4,
     author = {Lenny Jones and Daniel White},
     title = {A group-theoretic approach to covering systems},
     journal = {Algebra and discrete mathematics},
     pages = {250--262},
     publisher = {mathdoc},
     volume = {20},
     number = {2},
     year = {2015},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ADM_2015_20_2_a4/}
}