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Uralsk State University, Sverdlovsk. Translated from Sibirskii Matematicheskii Zhurnal, Vol. 20, No. 6, pp. 1282–1293, November–December, 1979.
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Rosenblatt, B.V. Positive theories of free inverse semigroups. Sib Math J 20, 910–918 (1979). https://doi.org/10.1007/BF00970391
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DOI: https://doi.org/10.1007/BF00970391