Voir la notice de l'article provenant de la source Czech Digital Mathematics Library
@article{KYB_1966__2_6_a1, author = {Gruska, Jozef}, title = {On sets generated by context-free grammars}, journal = {Kybernetika}, pages = {--493}, publisher = {mathdoc}, volume = {02}, number = {6}, year = {1966}, mrnumber = {0209091}, zbl = {0158.25308}, language = {en}, url = {http://geodesic.mathdoc.fr/item/KYB_1966__2_6_a1/} }
Gruska, Jozef. On sets generated by context-free grammars. Kybernetika, Tome 02 (1966) no. 6, p. 493. http://geodesic.mathdoc.fr/item/KYB_1966__2_6_a1/