Janusz A. Brzozowski, Radu Negulescu. Duality for Three: Ternary Symmetry in Process Spaces. In Juhani Karhumäki, Hermann A. Maurer, Gheorghe Paun, Grzegorz Rozenberg, editors, Theory Is Forever, Essays Dedicated to Arto Salomaa on the Occasion of His 70th Birthday. Volume 3113 of Lecture Notes in Computer Science, pages 1-14, Springer, 2004. [doi]
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