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Translated from Matematicheskie Zametki, Vol. 29, No. 3, pp. 335–350, March, 1981.
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Elizarov, V.P. Equivalent definitions of a perfect system and some of its properties. Mathematical Notes of the Academy of Sciences of the USSR 29, 173–181 (1981). https://doi.org/10.1007/BF01158524
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DOI: https://doi.org/10.1007/BF01158524