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    STEPHEN G. SIMPSON, Medvedev degrees of two-dimensional subshifts of finite type, Ergodic Theory and Dynamical Systems, 2014, 34, 02, 665

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  2. 2
    Emmanuel Jeandel, Pascal Vanier, Turing degrees of multidimensional SFTs, Theoretical Computer Science, 2013, 505, 81

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  3. 3
    D. R. Hirschfeldt, B. Khoussainov, Finitely presented expansions of computably enumerable semigroups, Algebra and Logic, 2012, 51, 5, 435

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