Yves Roos, Pierre-André Wacrenier. Composition of Two Semi Commutations. In Andrzej Tarlecki, editor, Mathematical Foundations of Computer Science 1991, 16th International Symposium, MFCS 91, Kazimierz Dolny, Poland, September 9-13, 1991, Proceedings. Volume 520 of Lecture Notes in Computer Science, pages 406-414, Springer, 1991.
Abstract is missing.