Louigi Addario-Berry Ketan Dalal Colin McDiarmid Bruce A. Reed Andrew Thomason Vertex-Colouring Edge-Weightings. 1-12 2007 27 Combinatorica 1 http://dx.doi.org/10.1007/s00493-007-0041-6 db/journals/combinatorica/combinatorica27.html#Addario-BerryDMRT07