Voir la notice de l'article provenant de la source Czech Digital Mathematics Library
@article{KYB_1975__11_1_a2, author = {Gruska, Jozef}, title = {A note on $\varepsilon$-rules in context-free grammars}, journal = {Kybernetika}, pages = {--31}, publisher = {mathdoc}, volume = {11}, number = {1}, year = {1975}, mrnumber = {0395317}, zbl = {0305.68061}, language = {en}, url = {http://geodesic.mathdoc.fr/item/KYB_1975__11_1_a2/} }
Gruska, Jozef. A note on $\varepsilon$-rules in context-free grammars. Kybernetika, Tome 11 (1975) no. 1, p. 31. http://geodesic.mathdoc.fr/item/KYB_1975__11_1_a2/