The topological structure of adherences of regular languages
RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 20 (1986) no. 1, pp. 31-41. 
@article{ITA_1986__20_1_31_0,
     author = {Head, Tom},
     title = {The topological structure of adherences of regular languages},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {31--41},
     publisher = {AFCET - Gauthier-Villars},
     address = {Paris},
     volume = {20},
     number = {1},
     year = {1986},
     mrnumber = {849963},
     zbl = {0608.68066},
     language = {en},
     url = {http://www.numdam.org/item/ITA_1986__20_1_31_0/}
}
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Head, Tom. The topological structure of adherences of regular languages. RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 20 (1986) no. 1, pp. 31-41. http://www.numdam.org/item/ITA_1986__20_1_31_0/

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