1. A. Aashtab, S. Akbari, M. Ghanbari, A. Shidani, Vertex partitioning of graphs into odd induced subgraphs, Discuss. Math. Graph. Theory.
2. The solution of the four-color map problem;Appel;Sci. Am.,1977
3. A new proof of the 6 color theorem;Borodin;J. Graph Theory,1995
4. Y. Caro, M. Petruševski, R. Škrekovski, Remarks on odd colorings of graphs, arXiv:2201.03608.
5. A linear-time algorithm for 7-coloring 1-plane graphs;Chen;Algorithmica,2005