%0 Journal Article %A Fuchs, Jaromír %T On closure operators on monoids %J Archivum mathematicum %D 1976 %P 225-232 %V 12 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/ARM_1976__12_4_a6/ %G en %F ARM_1976__12_4_a6