Disjunctive languages and compatible orders
RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 23 (1989) no. 2, pp. 149-163. 
@article{ITA_1989__23_2_149_0,
     author = {Ito, M. and Shyr, H. J. and Thierrin, G.},
     title = {Disjunctive languages and compatible orders},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {149--163},
     publisher = {EDP-Sciences},
     volume = {23},
     number = {2},
     year = {1989},
     mrnumber = {1001723},
     zbl = {0674.20040},
     language = {en},
     url = {http://www.numdam.org/item/ITA_1989__23_2_149_0/}
}
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Ito, M.; Shyr, H. J.; Thierrin, G. Disjunctive languages and compatible orders. RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 23 (1989) no. 2, pp. 149-163. http://www.numdam.org/item/ITA_1989__23_2_149_0/

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