@article{10_1017_S2040618500033955,
     author = {\'Swierczkowski, S.},
     title = {Abstract theory of packings and coverings. {II}},
     journal = {Glasgow mathematical journal},
     pages = {96--100},
     year = {1959},
     volume = {4},
     number = {2},
     doi = {10.1017/S2040618500033955},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S2040618500033955/}
}