no. 1
The separability of formal languages
RAIRO. Informatique théorique, Tome 16 (1982) no. 1, pp. 13-31 
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     volume = {16},
     number = {1},
     mrnumber = {677653},
     zbl = {0479.68079},
     language = {en},
     url = {https://www.numdam.org/item/ITA_1982__16_1_13_0/}
}
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Pinzani, R.; Sprugnoli, R. The separability of formal languages. RAIRO. Informatique théorique, Tome 16 (1982) no. 1, pp. 13-31. https://www.numdam.org/item/ITA_1982__16_1_13_0/

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