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References:
[1] G. Szász: Introduction to lattice theory. Publishing House of the Hungarian Аcademy of Sciences, Budapest (1962).
[2] V. Coardoş: Formal languages and Galois connections. (In print).
[3] M. Novotný: On some relations defined by languages. Prague Studies in Mathematical Linguistics 4 (1973), 157-170. MR 0483771
[4] B. M. Schein: Homomorphisms and subdirect decompositions of semigroups. Pacific J. of Math. 17 (1966), 529-547. MR 0197603 | Zbl 0197.01603
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