1. On Hadwiger's number and the stability number;P Duchet;Ann. Discrete Math,1982
2. Hadwiger's conjecture;P Seymour;Open Problems in Mathematics,2016
3. On a special case of Hadwiger's conjecture;M D Plummer;Discuss. Math. Graph Theory,2003
4. Graph coloring and the immersion order;F N Abu-Khzam;International Computing and Combinatorics Conference,2003