%0 Journal Article %A Herrlich, Horst %T Realizations of topologies and closure operators by set systems and by neighbourhoods %J Archivum mathematicum %D 1989 %P 83-87 %V 25 %N 1-2 %U http://geodesic.mathdoc.fr/item/ARM_1989_25_1-2_a10/ %G en %F ARM_1989_25_1-2_a10