%0 Journal Article %A Bielak, Halina %A Soczewińska, Elżbieta %T Some remarks about digraphs with nonisomorphic $1$- or $2$-neighbourhoods %J Časopis pro pěstování matematiky %D 1983 %P 299-304 %V 108 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.21136/CPM.1983.118166/ %R 10.21136/CPM.1983.118166 %G en %F 10_21136_CPM_1983_118166