@misc{10_4153_CMB_1974_074_7,
     title = {On {Adjacency} {Preserving} {Maps}},
     journal = {Canadian mathematical bulletin},
     pages = {403--405},
     year = {1974},
     volume = {17},
     number = {3},
     doi = {10.4153/CMB-1974-074-7},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1974-074-7/}
}