Grammatical levels and subgrammars of context-free grammars
Gruska, Jozef
Archivum Mathematicum, Tome 009 (1973), p. 19-21 / Harvested from Czech Digital Mathematics Library
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Publié le : 1973-01-01
Classification:  68Q45 
@article{104787,
     author = {Jozef Gruska},
     title = {Grammatical levels and subgrammars of context-free grammars},
     journal = {Archivum Mathematicum},
     volume = {009},
     year = {1973},
     pages = {19-21},
     zbl = {0282.68036},
     mrnumber = {0351163},
     language = {en},
     url = {http://dml.mathdoc.fr/item/104787}
}

Gruska, Jozef. Grammatical levels and subgrammars of context-free grammars. Archivum Mathematicum, Tome 009 (1973) pp. 19-21. http://gdmltest.u-ga.fr/item/104787/

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Gruska J. Complexity and unambiguity of context-free grammars and languages, Information and Control 18, 1971, 502-519. (1971) | MR 0311152 | Zbl 0238.68022

Maluszinski J. The lattice of subgrammars of context-free grammars, Algorytmy, V7, 1970, 21-27. (In Polish). (1970) | MR 0282764