no. 4
Categories of topological spaces with sufficiently many sequentially closed spaces
Cahiers de Topologie et Géométrie Différentielle Catégoriques, Tome 38 (1997) no. 4, pp. 277-300 
@article{CTGDC_1997__38_4_277_0,
     author = {Dikranjan, Dikran and Pelant, Jan},
     title = {Categories of topological spaces with sufficiently many sequentially closed spaces},
     journal = {Cahiers de Topologie et G\'eom\'etrie Diff\'erentielle Cat\'egoriques},
     pages = {277--300},
     year = {1997},
     publisher = {Dunod \'editeur, publi\'e avec le concours du CNRS},
     volume = {38},
     number = {4},
     mrnumber = {1487962},
     zbl = {0891.18004},
     language = {en},
     url = {https://www.numdam.org/item/CTGDC_1997__38_4_277_0/}
}
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Dikranjan, Dikran; Pelant, Jan. Categories of topological spaces with sufficiently many sequentially closed spaces. Cahiers de Topologie et Géométrie Différentielle Catégoriques, Tome 38 (1997) no. 4, pp. 277-300. https://www.numdam.org/item/CTGDC_1997__38_4_277_0/

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