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Hell, P., & Nešetřil, J. (2004-07-22). COLOURING—VARIATIONS ON A THEME. In Graphs and Homomorphisms. : Oxford University Press. Retrieved 22 Oct. 2019, from https://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780198528173.001.0001/acprof-9780198528173-chapter-6.