1. The medial graph and voltage-current duality;Archdeacon;Discrete Math.,1992
2. Solution of Ringel's problem about vertex bound colouring of planar graphs and colouring of 1-planar graphs;Borodin;Metody Discret Analiz.,1984
3. Topological Graph Theory;Gross,1987
4. A Classical Introduction to Modern Number Theory;Ireland,1982
5. A lower bound for the one-chromatic number of a surface;Korzhik;J. Combin. Theory Ser. B,1994