EXOO, G.; HARARY, F.; KABELL, J. The crossing numbers of some generalized Petersen graphs. Mathematica Scandinavica, Berkeley, CA, United States, v. 48, p. 184–188, 1981. DOI: 10.7146/math.scand.a-11910. Disponível em: https://journals.msp.org/mscand/article/view/1714. Acesso em: 25 jul. 2026.