@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}, zbl = {0387.68053}, mrnumber = {510636}, language = {en}, url = {http://archive.numdam.org/item/ITA_1978__12_3_193_0/} }