The separability of formal languages
RAIRO. Informatique théorique, Tome 16 (1982) no. 1, pp. 13-31. 
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}
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Pinzani, R.; Sprugnoli, R. The separability of formal languages. RAIRO. Informatique théorique, Tome 16 (1982) no. 1, pp. 13-31. http://www.numdam.org/item/ITA_1982__16_1_13_0/

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