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I. Sh. Kalimullin Supported by the Russian Ministry of Education and Science, project No. 1.451.2016/1.4.
A. Montalbán Supported by the Packard Fellowship and by the NSF grant DMS-0901169.
V. G. Puzarenko Supported by RFBR, project No. 18-01-00624-a.
Kh. Faizrahmanov Supported by the Russian Ministry of Education and Science, project No. 1.1515.2017/4.6.
Translated from Algebra i Logika, Vol. 57, No. 2, pp. 243-249, March-April, 2018.
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Kalimullin, I.S., Kach, A., Montalbán, A. et al. Jump Inversions of Algebraic Structures and the Σ-Definability. Algebra Logic 57, 161–165 (2018). https://doi.org/10.1007/s10469-018-9488-3
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DOI: https://doi.org/10.1007/s10469-018-9488-3