Mohamed Amin. A Note on the Incomparability of the EOL Family with Certain Families of Languages Generated by Cooperating Grammar Systems. 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 217-219, Springer, 1997.
Abstract is missing.