%0 Journal Article %A Sidney Penner %A Karl J. Schroeder %T Abstract Characterizations of Continuous Functions. %J Aequationes mathematicae %D 1974 %P 121-127 %V 11 %I mathdoc %U http://geodesic.mathdoc.fr/item/AM2_1974__11_136449/ %F AM2_1974__11_136449