Associative closure and periodicity of ω-words
RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 32 (1998) no. 4-6, pp. 153-174. 
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     author = {Mateescu, A. and Mateescu, G. D.},
     title = {Associative closure and periodicity of $\omega $-words},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {153--174},
     publisher = {EDP-Sciences},
     volume = {32},
     number = {4-6},
     year = {1998},
     mrnumber = {1672723},
     language = {en},
     url = {http://archive.numdam.org/item/ITA_1998__32_4-6_153_0/}
}
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Mateescu, A.; Mateescu, G. D. Associative closure and periodicity of $\omega $-words. RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 32 (1998) no. 4-6, pp. 153-174. http://archive.numdam.org/item/ITA_1998__32_4-6_153_0/

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