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References:
[1] Macnab D. S.: Modal operators on Heyting algebras. Algebra Univ. 12 (1981), 5-29. MR 0608645 | Zbl 0459.06005
[2] Rachůnek J.: Translations des ensembles ordonnés. Math. Slovaca 31 (1981), 337-340 MR 0637961 | Zbl 0472.06002
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