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Thomason, A. G. (1978), «Hamiltonian cycles and uniquely edge colourable graphs», Advances in Graph Theory (Cambridge Combinatorial Conf., Trinity College, Cambridge, 1977), Annals of Discrete Mathematics 3, pp. 259-268, ISBN9780720408430, MR499124, doi:10.1016/S0167-5060(08)70511-9..