1. Hajós’ graph colouring conjecture: variations and counterexamples;Catlin;J. Combin. Theory Ser. B,1979
2. Box complexes: At the crossroad of graph theory and topology;Daneshpajouh,2023
3. Reducing linear Hadwiger’s conjecture to coloring small graphs;Delcourt,2021
4. A property of 4-chromatic graphs and some remarks on critical graphs;Dirac;J. Lond. Math. Soc.,1952
5. A combinatorial inequality;Dol’nikov;Sib. Math. J.,1988