@article{ITA_2001__35_6_551_0,
     author = {Mateescu, Alexandru and Salomaa, Arto and Salomaa, Kai and Yu, Sheng},
     title = {A sharpening of the {Parikh} mapping},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {551--564},
     publisher = {EDP-Sciences},
     volume = {35},
     number = {6},
     year = {2001},
     mrnumber = {1922295},
     zbl = {1005.68092},
     language = {en},
     url = {http://archive.numdam.org/item/ITA_2001__35_6_551_0/}
}