@article{ITA_2001__35_6_535_0,
     author = {Cassaigne, Julien and Karhum\"aki, Juhani and Ma\v{n}uch, J\'an},
     title = {On conjugacy of languages},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {535--550},
     publisher = {EDP-Sciences},
     volume = {35},
     number = {6},
     year = {2001},
     mrnumber = {1922294},
     zbl = {1005.68121},
     language = {en},
     url = {http://www.numdam.org/item/ITA_2001__35_6_535_0/}
}