Geodesic
Countabliity of the set of closed overclasses of some minimal classes in the partly ordered set $\mathcal{L}^3_2$ of all closed classes of three-valued logic that can be mapped homomorphically onto two-valued logic
Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 1 (2017), pp. 62-64

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The following theorem is proved: the set of closed classes containing some minimal classes in the partly ordered set $\mathcal{L}^3_2$ of closed classes in the three-valued logic that may be mapped homomorphically onto the two-valued logic is countable. 
@article{VMUMM_2017_1_a10,
     author = {A. V. Makarov and V. V. Makarov},
     title = {Countabliity of the set of closed overclasses of some minimal classes in the partly ordered set $\mathcal{L}^3_2$ of all closed classes of three-valued logic that can be mapped homomorphically onto two-valued logic},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {62--64},
     publisher = {mathdoc},
     number = {1},
     year = {2017},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_2017_1_a10/}
}
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A. V. Makarov; V. V. Makarov. Countabliity of the set of closed overclasses of some minimal classes in the partly ordered set $\mathcal{L}^3_2$ of all closed classes of three-valued logic that can be mapped homomorphically onto two-valued logic. Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 1 (2017), pp. 62-64. http://geodesic.mathdoc.fr/item/VMUMM_2017_1_a10/