Figure 12. W(T), W(P) , W(K) and W(M) are LCL covers of a torus T and a projective plane P, a Klein bottle K and a Moebius band M, and G(T), G(P) , G(K) and G(M) are their intersection graphs. G(T), G(P) , G(K) and G(M) are digital 2-manifolds

From

Graph Theoretical Models of Closed n-Dimensional Manifolds: Digital Models of a Moebius Strip, a Projective Plane a Klein Bottle and n-Dimensional Spheres

Alexander V. Evako

Applied Mathematics and Physics. 2017, 5(1), 19-27 doi:10.12691/amp-5-1-3