@article{ITA_1978__12_3_201_0, author = {Boasson, L. and Horv\'ath, S.}, title = {On languages satisfying {Ogden's} lemma}, journal = {RAIRO. Informatique th\'eorique}, pages = {201--202}, publisher = {EDP-Sciences}, volume = {12}, number = {3}, year = {1978}, zbl = {0387.68054}, mrnumber = {510637}, language = {en}, url = {http://archive.numdam.org/item/ITA_1978__12_3_201_0/} }