Sorina Dumitrescu. Characterization of RE Using CD Grammar Systems with Two Registers and RL Rules. In Gheorghe Paun, Arto Salomaa, editors, New Trends in Formal Languages - Control, Cooperation, and Combinatorics (to Jürgen Dassow on the occasion of his 50th birthday). Volume 1218 of Lecture Notes in Computer Science, pages 167-177, Springer, 1997.
Abstract is missing.