%0 Journal Article %A Nebeský, Ladislav %T Signpost systems and spanning trees of graphs %J Czechoslovak Mathematical Journal %D 2006 %P 885-893 %V 56 %N 3 %U http://geodesic.mathdoc.fr/item/CMJ_2006_56_3_a6/ %G en %F CMJ_2006_56_3_a6