Tommi Lehtinen, Alexander Okhotin. On Equations over Sets of Numbers and Their Limitations. In Volker Diekert, Dirk Nowotka, editors, Developments in Language Theory, 13th International Conference, DLT 2009, Stuttgart, Germany, June 30 - July 3, 2009. Proceedings. Volume 5583 of Lecture Notes in Computer Science, pages 360-371, Springer, 2009. [doi]
Abstract is missing.