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Translated from Algebra i Logika, Vol. 23, No. 3, pp. 266–277, May–June, 1984.
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Lisovik, L.P. Construction of decidable singular theories of two successor functions with an extra predicate. Algebra and Logic 23, 181–189 (1984). https://doi.org/10.1007/BF01979864
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DOI: https://doi.org/10.1007/BF01979864