@article{GDZPPN002484684,
title = {On Two Finite Covering Problems of Bambah, Rogers, Woods and Zassenhaus.},
journal = {Monatshefte f\"ur Mathematik},
volume = {99},
year = {1985},
pages = {279-296},
zbl = {0564.52008},
url = {http://dml.mathdoc.fr/item/GDZPPN002484684}
}
Wills, J.M.; Gritzmann, P. On Two Finite Covering Problems of Bambah, Rogers, Woods and Zassenhaus.. Monatshefte für Mathematik, Tome 99 (1985) pp. 279-296. http://gdmltest.u-ga.fr/item/GDZPPN002484684/