Flavio D Alessandro, Gwénaël Richomme, Stefano Varricchio. Well Quasi Orders and the Shuffle Closure of Finite Sets. In Oscar H. Ibarra, Zhe Dang, editors, Developments in Language Theory, 10th International Conference, DLT 2006, Santa Barbara, CA, USA, June 26-29, 2006, Proceedings. Volume 4036 of Lecture Notes in Computer Science, pages 260-269, Springer, 2006. [doi]
Abstract is missing.