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On sentential forms of context-free grammars. (English) Zbl 0264.68029

MSC:
68Q45 Formal languages and automata
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[1] Gabrielian, A.: Pure grammars and pure languages. University of Waterloo, Department of Applied Analysis and Computer Science Research Report CSRR 2027 (1970). · Zbl 0454.68097
[2] Ginsburg, S.: The mathematical theory of context-free languages. McGraw-Hill 1966. · Zbl 0184.28401
[3] Paz, A., Salomaa, A.: Integral sequential word functions and growth equivalence of Lindenmayer systems. Information and Control, to appear. · Zbl 0273.68056
[4] Rozenberg, G.: The equivalence problem for deterministicTOL-systems is undecidable. SUNY at Buffalo, Department of Computer Science Report 24-72 (1972). · Zbl 0267.68033
[5] Salomaa, A.: Formal languages. Academic Press, 1973, to appear. · Zbl 0262.68025
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