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Johnson, Robert (2004) A disproof of the Fon-der-Flaass conjecture. Combinatorics, Probability and Computing, 13 (2). pp. 195-201. ISSN 0963-5483
Johnson, Robert (2004) Long cycles in the middle two Layers of the discrete cube. Journal of Combinatorial Theory, Series A, 105 (2). pp. 255-271. ISSN 0097-3165