Giuseppa Castiglione, Gabriele Fici, Antonio Restivo. On Sets of Words of Rank Two. In Robert Mercas, Daniel Reidenbach, editors, Combinatorics on Words - 12th International Conference, WORDS 2019, Loughborough, UK, September 9-13, 2019, Proceedings. Volume 11682 of Lecture Notes in Computer Science, pages 46-59, Springer, 2019. [doi]
Abstract is missing.