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Grammatical levels and subgrammars of context-free grammars
Archivum mathematicum, Tome 9 (1973) no. 1, pp. 19-21 Cet article a éte moissonné depuis la source Czech Digital Mathematics Library

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Gruska, Jozef. Grammatical levels and subgrammars of context-free grammars. Archivum mathematicum, Tome 9 (1973) no. 1, pp. 19-21. http://geodesic.mathdoc.fr/item/ARM_1973_9_1_a2/

[1] Ginsburg S.: The mathematical theory of context-free languages. McGraw-Hill, New York, 1966. | MR | Zbl

[2] Gruska J.: Some classifications of context-free languages. Information and Control 14, 1969 1969, 152-173. | MR | Zbl

[3] Gruska J.: Complexity and unambiguity of context-free grammars and languages. Information and Control 18, 1971, 502-519. | MR | Zbl

[4] Maluszinski J.: The lattice of subgrammars of context-free grammars. Algorytmy, V7, 1970, 21-27. (In Polish). | MR