no. 2
On simply bireflective subcategories
Cahiers de topologie et géométrie différentielle, Tome 17 (1976) no. 2, pp. 187-201. 
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     title = {On simply bireflective subcategories},
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     volume = {17},
     number = {2},
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     url = {http://www.numdam.org/item/CTGDC_1976__17_2_187_0/}
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Menu, Jan; Pultr, Aleš. On simply bireflective subcategories. Cahiers de topologie et géométrie différentielle, Tome 17 (1976) no. 2, pp. 187-201. http://www.numdam.org/item/CTGDC_1976__17_2_187_0/

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