Voir la notice de l'article provenant de la source Czech Digital Mathematics Library
@article{ARM_1970__6_3_a2, author = {Novotn\'y, Miroslav}, title = {On a class of languages}, journal = {Archivum mathematicum}, pages = {155--170}, publisher = {mathdoc}, volume = {06}, number = {3}, year = {1970}, mrnumber = {0319421}, zbl = {0236.68030}, language = {en}, url = {http://geodesic.mathdoc.fr/item/ARM_1970__6_3_a2/} }
Novotný, Miroslav. On a class of languages. Archivum mathematicum, Tome 06 (1970) no. 3, pp. 155-170. http://geodesic.mathdoc.fr/item/ARM_1970__6_3_a2/