no. 4
A hierarchy of cyclic languages
RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 31 (1997) no. 4, pp. 355-369. 
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     author = {Carton, O.},
     title = {A hierarchy of cyclic languages},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {355--369},
     publisher = {EDP-Sciences},
     volume = {31},
     number = {4},
     year = {1997},
     mrnumber = {1605786},
     zbl = {0892.68056},
     language = {en},
     url = {http://archive.numdam.org/item/ITA_1997__31_4_355_0/}
}
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Carton, O. A hierarchy of cyclic languages. RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 31 (1997) no. 4, pp. 355-369. http://archive.numdam.org/item/ITA_1997__31_4_355_0/

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