Boris I. Plotkin, Tatjana L. Plotkin. Categories of Elementary Sets over Algebras and Categories of Elementary Algebraic Knowledge. In Arnon Avron, Nachum Dershowitz, Alexander Rabinovich, editors, Pillars of Computer Science, Essays Dedicated to Boris (Boaz) Trakhtenbrot on the Occasion of His 85th Birthday. Volume 4800 of Lecture Notes in Computer Science, pages 555-570, Springer, 2008. [doi]
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