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Citations edit
Some encyclopedic information on the application of Kempe chains to the four colour theorem and the five color theorem can be found in the following papers: The Proof is in the Pudding, The Journey of the Four Colour Theorem Through Time, The 5 Colour Theorem in Isabelle/Isar, and The Four Color Theorem. --Omnipaedista (talk) 07:05, 19 February 2010 (UTC)