@article{MOMA_1984__98_178208,
     author = {Richard Warlimont},
     title = {Covering {Sets} by {Subsets.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {323--330},
     publisher = {mathdoc},
     volume = {98},
     year = {1984},
     zbl = {0545.05006},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1984__98_178208/}
}