@article{ITA_2004__38_1_49_0, author = {Silva, Pedro V.}, title = {Free group languages : rational versus recognizable}, journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications}, pages = {49--67}, publisher = {EDP-Sciences}, volume = {38}, number = {1}, year = {2004}, doi = {10.1051/ita:2004003}, zbl = {1082.68071}, mrnumber = {2059028}, language = {en}, url = {http://www.numdam.org/articles/10.1051/ita:2004003/} }