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References:
[1] Birkhoff G.: Subdirect unions in universal algebras. Bull. Amer. Math. Soc. 50 (1944), 764-768. MR 0010542
[2] Chajda I.: Lattices in quasiordered sets. Acta UPO, Fac. Rer. Nat., Math. XXXI, Vol. 105, 31(1992), 6-12. MR 1212600 | Zbl 0773.06002
[3] Chajda I.: An algebra of quasiordered logic. Math. Bohemica, to appear. MR 1293245 | Zbl 0816.06007
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