Journal of Automata, Languages and Combinatorics formerly:
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@article{jalc120107, author = {Henning Fernau and Rudolf Freund and Marion Oswald and Klaus Reinhardt}, title = {Refining the Nonterminal Complexity of Graph-Controlled, Programmed, and Matrix Grammars}, journal = jalc, year = 2007, volume = 12, number = {1/2}, pages = {117--138} }