%0 Journal Article %A T. McKee %T Dual properties within graph theory %J Fundamenta Mathematicae %D 1987 %P 91-97 %V 128 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/fm-128-2-91-97/ %R 10.4064/fm-128-2-91-97 %G en %F 10_4064_fm_128_2_91_97