no. 1
When is Ω a cogenerator in a topos ?
Cahiers de topologie et géométrie différentielle, Tome 16 (1975) no. 1, pp. 3-15. 
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     title = {When is $\Omega $ a cogenerator in a topos ?},
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     number = {1},
     year = {1975},
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     mrnumber = {382393},
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     url = {http://www.numdam.org/item/CTGDC_1975__16_1_3_0/}
}
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Borceux, Francis. When is $\Omega $ a cogenerator in a topos ?. Cahiers de topologie et géométrie différentielle, Tome 16 (1975) no. 1, pp. 3-15. http://www.numdam.org/item/CTGDC_1975__16_1_3_0/

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