@article{SLC_2002-2004_49_a6,
     author = {Roman K\"onig},
     title = {Endliche {H\"ullensysteme} und ihre {Implikationenbasen}},
     journal = {S\'eminaire lotharingien de combinatoire},
     year = {2002-2004},
     volume = {49},
     url = {http://geodesic.mathdoc.fr/item/SLC_2002-2004_49_a6/}
}