Literature cited
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Additional information
Translated from Algebra i Logika, Vol. 8, No. 6, pp. 726–732, November–December, 1969.
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Khutoretskii, A.B. On nonprincipal enumerations. Algebr Logic 8, 412–415 (1969). https://doi.org/10.1007/BF02219655
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DOI: https://doi.org/10.1007/BF02219655