%0 Journal Article %A HorĂ¡k, Peter %T A note on removing a point of a strong digraph %J Mathematica slovaca %D 1983 %P 85-86 %V 33 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/MASLO_1983__33_1_a13/ %G en %F MASLO_1983__33_1_a13