no. 2
Relational morphisms and operations on recognizable sets
RAIRO. Informatique théorique, Tome 15 (1981) no. 2, pp. 149-159 
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     title = {Relational morphisms and operations on recognizable sets},
     journal = {RAIRO. Informatique th\'eorique},
     pages = {149--159},
     year = {1981},
     publisher = {EDP Sciences},
     volume = {15},
     number = {2},
     mrnumber = {618452},
     zbl = {0463.20049},
     language = {en},
     url = {https://www.numdam.org/item/ITA_1981__15_2_149_0/}
}
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Straubing, Howard. Relational morphisms and operations on recognizable sets. RAIRO. Informatique théorique, Tome 15 (1981) no. 2, pp. 149-159. https://www.numdam.org/item/ITA_1981__15_2_149_0/

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