Zoltán Ésik. The Equational Theory of Fixed Points with Applications to Generalized Language Theory. In Werner Kuich, Grzegorz Rozenberg, Arto Salomaa, editors, Developments in Language Theory, 5th International Conference, DLT 2001, Vienna, Austria, July 16-21, 2001, Revised Papers. Volume 2295 of Lecture Notes in Computer Science, pages 21-36, Springer, 2001. [doi]
Abstract is missing.