References:
V. Cazanescu, Introducere in teoria limbajelor formale, Editura Academiei, Bucuresti, 1983.
J.E. Hopcroft, J.D. Ullman, Introduction to Automata Theory, Languages, and Computation, Addison-Wesley, 1979.
G. Paun, Probleme actuale in teoria limbajelor formale, Ed. Stiintifica si Enciclopedica, Bucuresti, 1984.
G. Rozenberg, A. Salomaa Eds. , Handbook of Formal Languages, Springer Verlag, Berlin, 1999.
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