1. H. Ardal, J. Manuch, M. Rosenfeld, S. Shelah and L. Stacho, The odd-distance plane graph, Discrete Comput. Geom. 42 (2009), 132–141.
2. M. Benda and M. Perles, Colorings of metric spaces, Geombinatorics IX (3) (2000), 113–126.
3. N. Brown, N. Dunfield and G. Perry, Colorings of the plane I, Geombinatorics III (2) (1993), 24–31.
4. N. Brown, N. Dunfield and G. Perry, Colorings of the plane II, Geombinatorics III (3) (1993), 64–74.
5. N. Brown, N. Dunfield and G. Perry, Colorings of the plane III, Geombinatorics III (4) (1993), 110–114.