%0 Journal Article %A Dimiter Ivanchev %T Finding the k Most Vital Elements of an s-t Planar Directed Network %J Yugoslav journal of operations research %D 2000 %P 13 %V 10 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/YJOR_2000_10_1_a1/ %G en %F YJOR_2000_10_1_a1