@article{ITA_1998__32_4-6_153_0,
     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://www.numdam.org/item/ITA_1998__32_4-6_153_0/}
}