@article{ITA_1992__26_3_287_0,
     author = {Honkala, J. and Salomaa, A.},
     title = {Caract\'erisation results about $L$ codes},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {287--301},
     publisher = {EDP-Sciences},
     volume = {26},
     number = {3},
     year = {1992},
     mrnumber = {1170327},
     zbl = {0751.68033},
     language = {en},
     url = {http://www.numdam.org/item/ITA_1992__26_3_287_0/}
}