Geodesic
Grammatical levels and subgrammars of context-free grammars
Archivum mathematicum, Tome 09 (1973) no. 1, pp. 19-21.

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Classification : 68Q45 
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     author = {Gruska, Jozef},
     title = {Grammatical levels and subgrammars of context-free grammars},
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     number = {1},
     year = {1973},
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     zbl = {0282.68036},
     language = {en},
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}
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Gruska, Jozef. Grammatical levels and subgrammars of context-free grammars. Archivum mathematicum, Tome 09 (1973) no. 1, pp. 19-21. http://geodesic.mathdoc.fr/item/ARM_1973__9_1_a2/