%0 Journal Article %A Zelinka, Bohdan %T The group of autotopies of a digraph %J Czechoslovak Mathematical Journal %D 1971 %P 619-624 %V 21 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1971.101060/ %R 10.21136/CMJ.1971.101060 %G en %F 10_21136_CMJ_1971_101060