1. Behzad, M.: Graphs and their chromatic numbers, Ph.D. Thesis, Michigan State University, 1965
2. Borodin, O. V.: Coupled colorings of graphs on a plane (in Russian). Metody Diskret. Analiz, 45, 21–27 (1987)
3. Borodin, O. V.: On the total coloring of planar graphs. J. Reine Angew. Math., 394, 180–185 (1989)
4. Borodin, O. V., Kostochka, A. V., Woodall, D. R.: Total colorings of planar graphs with large maximum degree. J. Graph Theory, 26, 53–59 (1997)
5. Borodin, O. V., Kostochka, A. V., Woodall, D. R.: List edge and list total colourings of multigarphs. J. Combin. Theory Ser. B, 71, 184–204 (1997)