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Literature Cited
Yu. L. Ershov, Theory of Numerations [in Russian], Nauka, Moscow (1977).
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Additional information
Novosibirsk. Yuzhno-Sakhalinsk. Translated from Sibirskii Matematicheskii Zhurnal, Vol. 31, No. 1, pp. 64–69, January–February, 1990.
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Dvornikov, S.G., Rybina, T.V. Denseness properties of the lattice of separation-degrees. Sib Math J 31, 52–57 (1990). https://doi.org/10.1007/BF00971149
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DOI: https://doi.org/10.1007/BF00971149