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REFERENCES
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Jablonskii, S. V., Some results in the theory of functional systems (Russian), in Proceedings of the International Congress of Mathematicians (Helsinki, 1978), pp. 963-971, Acad. Sci. Fennica, Helsinki, 1980.
Rosenberg, Ivo; The number of maximal closed classes in the set of functions over a finite domain. J. Combinatorial Theory Ser. A 14 (1973), 1-7.
Zaharova, E. Ju.; Kudrjavcev, V. B.; Jablonskii, S. V. Precomplete classes in $k$-valued logics. (Russian) Dokl. Akad. Nauk SSSR 186 1969 509-512. English translation in Soviet Math. Doklady 10 (No. 3, 1969), 618-622.
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