1. Weinberg bounds over nonspherical graphs;Chen;J. Graph Theory,2000
2. S. Kitakubo, Embeddings of graphs into the projective plane, Doctor Thesis, Tokyo Institute of Technology, 1992.
3. Re-embedding structures of 5-connected projective-planar graphs;Kitakubo;Discrete Math.,2002
4. S. Lawrencenko, Explicit lists of the automorphisms and re-embeddings of the torus irreducible triangulations, Kharkov, 1987 (in Russian). Manuscript deposited in Ukrain. Inst. of Sci., Tech. and Econ. Inf. on 1 October 1987, Dep. No. 2779-Uk. 87.
5. The irreducible triangulations of the torus;Lawrencenko;Ukrain. Geom. Sb.,1987