Archdeacon proved that projective-planar graphs are characterized by 35 excluded minors. Using this result we show that internally 4-connected projective-planar graphs are characterized by 23 internally 4-connected excluded minors. © 2014 Elsevier Inc.
Publication Source (Journal or Book title)
Journal of Combinatorial Theory. Series B
Ding, G., & Iverson, P. (2014). Internally 4-connected projective-planar graphs. Journal of Combinatorial Theory. Series B, 108 (1), 123-138. https://doi.org/10.1016/j.jctb.2014.03.003