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References:
[1] L. Nebeský: Hypergraphs and intervals. Czechoslovak Math. J. 31 (106) (1981), 469-474. MR 0626920
[2] L. Nebeský: Hypergraphs and intervals, II. Časopis pěst. mat. 109 (1984), 286-289. MR 0755594
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