@article{ITA_2001__35_6_597_0,
     author = {Pin, Jean-Eric and Weil, Pascal},
     title = {A conjecture on the concatenation product},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {597--618},
     publisher = {EDP-Sciences},
     volume = {35},
     number = {6},
     year = {2001},
     doi = {10.1051/ita:2001134},
     mrnumber = {1922298},
     zbl = {1011.20054},
     language = {en},
     url = {http://www.numdam.org/articles/10.1051/ita:2001134/}
}