Donatella Merlini, Renzo Sprugnoli, M. Cecilia Verri. Algebraic and Combinatorial Properties of Simple, Coloured Walks. In Sophie Tison, editor, Trees in Algebra and Programming - CAAP 94, 19th International Colloquium, Edinburgh, U.K., April 11-13, 1994, Proceedings. Volume 787 of Lecture Notes in Computer Science, pages 218-233, Springer, 1994.
Abstract is missing.