no. 3
Every commutative quasirational language is regular
RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 20 (1986) no. 3, pp. 319-337. 
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     author = {Kortelainen, Juha},
     title = {Every commutative quasirational language is regular},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {319--337},
     publisher = {AFCET - Gauthier-Villars},
     address = {Paris},
     volume = {20},
     number = {3},
     year = {1986},
     mrnumber = {894717},
     zbl = {0617.68069},
     language = {en},
     url = {http://www.numdam.org/item/ITA_1986__20_3_319_0/}
}
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Kortelainen, Juha. Every commutative quasirational language is regular. RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 20 (1986) no. 3, pp. 319-337. http://www.numdam.org/item/ITA_1986__20_3_319_0/

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