@article{ITA_2005__39_4_641_0,
     author = {Thomsen, Klaus},
     title = {Languages of finite words occurring infinitely many times in an infinite word},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {641--650},
     publisher = {EDP-Sciences},
     volume = {39},
     number = {4},
     year = {2005},
     doi = {10.1051/ita:2005033},
     mrnumber = {2172143},
     language = {en},
     url = {http://www.numdam.org/articles/10.1051/ita:2005033/}
}