Jan A. Bergstra, John V. Tucker. Elementary Algebraic Specifications of the Rational Complex Numbers. In Kokichi Futatsugi, Jean-Pierre Jouannaud, José Meseguer, editors, Algebra, Meaning, and Computation, Essays Dedicated to Joseph A. Goguen on the Occasion of His 65th Birthday. Volume 4060 of Lecture Notes in Computer Science, pages 459-475, Springer, 2006. [doi]
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