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Translated from Kibernetika iSistemnyi Analiz, No. 5, pp. 30–36, September–October, 1997.
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Plotnikov, A.D. Formalization of the class of problems solvable by a nondeterministic turing machine. Cybern Syst Anal 33, 635–640 (1997). https://doi.org/10.1007/BF02667185
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DOI: https://doi.org/10.1007/BF02667185