%0 Journal Article %A Krystock, Robert L. %T ON H-Sets and Open Filter Adherences(1) %J Canadian mathematical bulletin %D 1988 %P 37-44 %V 31 %N 1 %U http://geodesic.mathdoc.fr/articles/10.4153/CMB-1988-006-8/ %R 10.4153/CMB-1988-006-8 %F 10_4153_CMB_1988_006_8