no. 3
Closure properties of certain families of formal languages with respect to a generalization of cyclic closure
RAIRO. Informatique théorique, Tome 15 (1981) no. 3, pp. 233-252. 
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     author = {Brandstadt, Andreas},
     title = {Closure properties of certain families of formal languages with respect to a generalization of cyclic closure},
     journal = {RAIRO. Informatique th\'eorique},
     pages = {233--252},
     publisher = {EDP-Sciences},
     volume = {15},
     number = {3},
     year = {1981},
     mrnumber = {630064},
     zbl = {0467.68066},
     language = {en},
     url = {http://www.numdam.org/item/ITA_1981__15_3_233_0/}
}
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Brandstadt, Andreas. Closure properties of certain families of formal languages with respect to a generalization of cyclic closure. RAIRO. Informatique théorique, Tome 15 (1981) no. 3, pp. 233-252. http://www.numdam.org/item/ITA_1981__15_3_233_0/

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