@article{10_21136_CPM_1983_118166,
     author = {Bielak, Halina and Soczewi\'nska, El\.zbieta},
     title = {Some remarks about digraphs with nonisomorphic $1$- or $2$-neighbourhoods},
     journal = {\v{C}asopis pro p\v{e}stov\'an{\'\i} matematiky},
     pages = {299--304},
     publisher = {mathdoc},
     volume = {108},
     number = {3},
     year = {1983},
     doi = {10.21136/CPM.1983.118166},
     mrnumber = {716416},
     zbl = {0525.05028},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CPM.1983.118166/}
}