@article{10_21136_CPM_1983_118165,
     author = {Bielak, Halina},
     title = {On graphs with nonisomorphic $2$-neighbourhoods},
     journal = {\v{C}asopis pro p\v{e}stov\'an{\'\i} matematiky},
     pages = {294--298},
     publisher = {mathdoc},
     volume = {108},
     number = {3},
     year = {1983},
     doi = {10.21136/CPM.1983.118165},
     mrnumber = {716415},
     zbl = {0526.05056},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CPM.1983.118165/}
}