@article{ITA_1978__12_3_193_0,
     author = {Horv\'ath, S\'andor},
     title = {The family of languages satisfying {Bar-Hillel's} lemma},
     journal = {RAIRO. Informatique th\'eorique},
     pages = {193--199},
     publisher = {EDP-Sciences},
     volume = {12},
     number = {3},
     year = {1978},
     mrnumber = {510636},
     zbl = {0387.68053},
     language = {en},
     url = {http://www.numdam.org/item/ITA_1978__12_3_193_0/}
}