%0 Journal Article %A Denny H. Leung %A Wee-Kee Tang %A Atok Zulijanto %T A gauge approach to an ordinal index of Baire one functions %J Fundamenta Mathematicae %D 2010 %P 99-109 %V 210 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/fm210-2-1/ %R 10.4064/fm210-2-1 %G en %F 10_4064_fm210_2_1