@article{02041493,
title = {Finite hull systems and their implication bases. (Endliche H\"ullensysteme und ihre Implikationenbasen.)},
journal = {S\'eminaire Lotharingien de Combinatoire [electronic only]},
volume = {49},
year = {2002},
zbl = {1033.06003},
language = {en},
url = {http://dml.mathdoc.fr/item/02041493}
}
König, Roman. Finite hull systems and their implication bases. (Endliche Hüllensysteme und ihre Implikationenbasen.). Séminaire Lotharingien de Combinatoire [electronic only], Tome 49 (2002) . http://gdmltest.u-ga.fr/item/02041493/