Danièle Beauquier, Maurice Nivat. About Rational Sets of Factors of a Bi-Infinite Word. In Wilfried Brauer, editor, Automata, Languages and Programming, 12th Colloquium, Nafplion, Greece, July 15-19, 1985, Proceedings. Volume 194 of Lecture Notes in Computer Science, pages 33-42, Springer, 1985.
Abstract is missing.