Weak products for universal algebra and model theory
Diagrammes, Tome 8 (1982), Exposé no. 2, 15 p. 
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     title = {Weak products for universal algebra and model theory},
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     year = {1982},
     publisher = {Universit\'e Paris 7, Unit\'e d'enseignement et de recherche de math\'ematiques},
     volume = {8},
     mrnumber = {780445},
     zbl = {0525.08002},
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     url = {https://www.numdam.org/item/DIA_1982__8__A2_0/}
}
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Sain, I. Weak products for universal algebra and model theory. Diagrammes, Tome 8 (1982), Exposé no. 2, 15 p.. https://www.numdam.org/item/DIA_1982__8__A2_0/

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