Joost Engelfriet, Sebastian Maneth. Hierarchies of String Languages Generated by Deterministic Tree Transducers. 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 228-238, Springer, 2001. [doi]
Abstract is missing.