1. Graphs and their chromatic numbers;Behzad,1965
2. A study of the total chromatic number of equibipartite graphs;Chen;Discrete Math.,1998
3. B.L. Chen, H.L. Fu, C.H. Lin, K.C. Huang, On the total chromatic number of regular bipartite graphs, manuscript.
4. Some refinements of the total chromatic number conjecture;Chetwynd,1988
5. Systemy par cikliceskogo tipa;Korovina;Mat. Zametki,1980