@article{ITA_1991__25_3_255_0,
     author = {Herbst, Thomas},
     title = {On a subclass of context-free groups},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {255--272},
     publisher = {EDP-Sciences},
     volume = {25},
     number = {3},
     year = {1991},
     mrnumber = {1119044},
     zbl = {0751.68040},
     language = {en},
     url = {http://www.numdam.org/item/ITA_1991__25_3_255_0/}
}