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References:
[1] Hall M., Jr.: Combinatorial Theory. Waltham--Toronto--London 1967. MR 0224481 | Zbl 0196.02401
[2] Sačkov V. N.: Kombiatornyje metody diskretnoj matěmatiki. Moskva 1977.
[3] Birkhoff G.: Lattice Theory. Third (New) Edition, New Yoгk 1967. MR 0227053 | Zbl 0153.02501
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