%0 Journal Article %A Geschke, Stefan %T 2-dimensional Convexity Numbers and P 4-free Graphs %J Canadian mathematical bulletin %D 2014 %P 61-71 %V 57 %N 1 %U http://geodesic.mathdoc.fr/articles/10.4153/CMB-2012-031-5/ %R 10.4153/CMB-2012-031-5 %F 10_4153_CMB_2012_031_5