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Gruska, Jozef
Grammatical levels and subgrammars of context-free grammars. (English). Archivum Mathematicum, vol. 9 (1973), issue 1, pp. 19-21
MSC: 68Q45 | MR 0351163 | Zbl 0282.68036
References:
[1] Ginsburg S.: The mathematical theory of context-free languages. McGraw-Hill, New York, 1966. MR 0211815 | Zbl 0184.28401
[2] Gruska J.: Some classifications of context-free languages. Information and Control 14, 1969 1969, 152-173. MR 0253836 | Zbl 0174.28901
[3] Gruska J.: Complexity and unambiguity of context-free grammars and languages. Information and Control 18, 1971, 502-519. MR 0311152 | Zbl 0238.68022
[4] Maluszinski J.: The lattice of subgrammars of context-free grammars. Algorytmy, V7, 1970, 21-27. (In Polish). MR 0282764
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