Ewa Orlowska, Anna Maria Radzikowska. Knowledge Algebras and Their Discrete Duality. In Andrzej Skowron, Zbigniew Suraj, editors, Rough Sets and Intelligent Systems - Professor Zdzisław Pawlak in Memoriam - Volume 2. Volume 43 of Intelligent Systems Reference Library, pages 7-20, Springer, 2013. [doi]
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