no. 3
Topologies on free monoids induced by families of languages
RAIRO. Informatique théorique, Tome 17 (1983) no. 3, pp. 285-290 
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     author = {Prodinger, Helmut},
     title = {Topologies on free monoids induced by families of languages},
     journal = {RAIRO. Informatique th\'eorique},
     pages = {285--290},
     year = {1983},
     publisher = {EDP Sciences},
     volume = {17},
     number = {3},
     mrnumber = {743890},
     zbl = {0533.20041},
     language = {en},
     url = {https://www.numdam.org/item/ITA_1983__17_3_285_0/}
}
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Prodinger, Helmut. Topologies on free monoids induced by families of languages. RAIRO. Informatique théorique, Tome 17 (1983) no. 3, pp. 285-290. https://www.numdam.org/item/ITA_1983__17_3_285_0/

1. R. Engelking, Outline of General Topology, North-Holland, Amsterdam, 1968. | Zbl | MR

2. H. Prodinger, Topologies on Free Monoids Induced by Closure Operators of a Special Type, R.A.I.R.O., Informatique théorique, Vol. 14, 1980, pp. 225-237. | Zbl | MR | Numdam