Any 7-Chromatic Graphs Has ::::K::::::7:: Or ::::K::::::4, 4:: As A Minor

Ken-ichi Kawarabayashi, Bjarne Toft. Any 7-Chromatic Graphs Has ::::K::::::7:: Or ::::K::::::4, 4:: As A Minor. Combinatorica, 25(3):327-353, 2005. [doi]

Abstract

Abstract is missing.