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Additional information
Translated from Kibernetika i Sistemnyi Analiz, No. 5, pp. 3–15, September–October, 1997.
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Red'ko, V.N., Brona, Y.I. & Bui, D.B. Division and renaming in relational algebras. Cybern Syst Anal 33, 615–623 (1997). https://doi.org/10.1007/BF02667183
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DOI: https://doi.org/10.1007/BF02667183