1. Every planar map is four colorable. Part I. Discharging;Appel;Illinois J Math,1977
2. Every planar map is four colorable. Part II. Reducibility;Appel;Illinois J Math,1977
3. On the total coloring of planar graphs;Borodin;J Reine Angew Math,1989
4. Sufficient conditions for planar graphs with girth 6 to be 2-distance colourable;Borodin;Sib Elektron Mat Izv,2006
5. (5,2)-coloring of sparse graphs;Borodin;Sib Elektron Mat Izv,2008