Henning Bordihn, Markus Holzer, Martin Kutrib. Input Reversals and Iterated Pushdown Automata: A New Characterization of Khabbaz Geometric Hierarchy of Languages. In Cristian Calude, Elena Calude, Michael J. Dinneen, editors, Developments in Language Theory, 8th International Conference, DLT 2004, Auckland, New Zealand, December 13-17, 2004, Proceedings. Volume 3340 of Lecture Notes in Computer Science, pages 102-113, Springer, 2004. [doi]
Abstract is missing.