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Yu. L. Ershov, Theory of Numerations [in Russian], Nauka, Moscow (1977).
H. G. Rice, “Classes of r.e. sets and their decision problems,” Trans. Am. Math. Soc.,74, No. 2, 358–366 (1953).
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Translated from Matematicheskie Zametki, Vol. 50, No. 4, pp. 61–66, October, 1991.
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Degtev, A.N. The semilattice of computable families of recursively enumerable sets. Mathematical Notes of the Academy of Sciences of the USSR 50, 1027–1030 (1991). https://doi.org/10.1007/BF01137732
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DOI: https://doi.org/10.1007/BF01137732