Two-colouring all two-element maximal antichains

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@article{Duffus1991TwocolouringAT, title={Two-colouring all two-element maximal antichains}, author={Dwight Duffus and Bill Sands and Norbert Sauer and Robert E. Woodrow}, journal={J. Comb. Theory, Ser. A}, year={1991}, volume={57}, pages={109-116} }