@article{DCG_1989__4_6_131061,
     author = {H. Maehara},
     title = {Note on {Induced} {Subgraphs} of the {Unit} {Distance}  {Graph} {En.}},
     journal = {Discrete & computational geometry},
     pages = {15--18},
     year = {1989},
     volume = {4},
     number = {6},
     zbl = {0652.05019},
     url = {http://geodesic.mathdoc.fr/item/DCG_1989__4_6_131061/}
}