%0 Journal Article %A Boonpok, Chawalit %T $\partial$-closed sets in biclosure spaces %J Communications in Mathematics %D 2009 %P 51-66 %V 17 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/COMIM_2009__17_1_a5/ %G en %F COMIM_2009__17_1_a5