%0 Journal Article %A Che, Zhongyuan %T Existence of perfect matchings in a plane bipartite graph %J Czechoslovak Mathematical Journal %D 2010 %P 489-494 %V 60 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/CMJ_2010__60_2_a13/ %G en %F CMJ_2010__60_2_a13