Geodesic
On star height hierarchies of context-free languages
Kybernetika, Tome 09 (1973) no. 4, p. 236.

Voir la notice de l'article provenant de la source Czech Digital Mathematics Library

Classification : 68A30, 68Q45, 94A30 
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     author = {Gruska, Jozef},
     title = {On star height hierarchies of context-free languages},
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Gruska, Jozef. On star height hierarchies of context-free languages. Kybernetika, Tome 09 (1973) no. 4, p. 236. http://geodesic.mathdoc.fr/item/KYB_1973__9_4_a0/