@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},
     mrnumber = {510637},
     zbl = {0387.68054},
     language = {en},
     url = {http://www.numdam.org/item/ITA_1978__12_3_201_0/}
}