On filters and upper sets in CI-algebras von Piekart, Bozena, Walendziak, Andrzej

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Radical theory in \(BCH\)-algebras von Dudek, Wieslaw A., Jun, Young Bae

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Quasi-valuation maps based on positive implicative ideals in BCK-algebras von Jun, Young Bae, Lee, Kyoung Ja, Song, Seok Zun

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