no. 4-6
Finite idempotent groupoids and regular languages
RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 32 (1998) no. 4-6, pp. 127-140. 
@article{ITA_1998__32_4-6_127_0,
     author = {Beaudry, M.},
     title = {Finite idempotent groupoids and regular languages},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {127--140},
     publisher = {EDP-Sciences},
     volume = {32},
     number = {4-6},
     year = {1998},
     mrnumber = {1672715},
     language = {en},
     url = {http://archive.numdam.org/item/ITA_1998__32_4-6_127_0/}
}
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Beaudry, M. Finite idempotent groupoids and regular languages. RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 32 (1998) no. 4-6, pp. 127-140. http://archive.numdam.org/item/ITA_1998__32_4-6_127_0/

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