@article{1183524923,
author = {Battle, Joseph and Harary, Frank and Kodama, Yukihiro},
title = {Every planar graph with nine points has a nonplanar complement},
journal = {Bull. Amer. Math. Soc.},
volume = {68},
number = {6},
year = {1962},
pages = { 569-571},
language = {en},
url = {http://dml.mathdoc.fr/item/1183524923}
}
Battle, Joseph; Harary, Frank; Kodama, Yukihiro. Every planar graph with nine points has a nonplanar complement. Bull. Amer. Math. Soc., Tome 68 (1962) no. 6, pp. 569-571. http://gdmltest.u-ga.fr/item/1183524923/