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Kishinev. Translated from Sibirskii Matematicheskii Zhurnal, Vol. 31, No. 4, pp. 111–117, July–August, 1990.
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Muravitskii, A.Y. Magari and Δ-pseudo-Boolean algebras. Sib Math J 31, 623–628 (1990). https://doi.org/10.1007/BF00970634
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DOI: https://doi.org/10.1007/BF00970634