no. 2
On regular and homological closure operators
Cahiers de Topologie et Géométrie Différentielle Catégoriques, Tome 51 (2010) no. 2, article no. 3, 16 p. 
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     title = {On regular and homological closure operators},
     journal = {Cahiers de Topologie et G\'eom\'etrie Diff\'erentielle Cat\'egoriques},
     eid = {3},
     pages = {127--142},
     publisher = {Andr\'ee CHARLES EHRESMANN},
     volume = {51},
     number = {2},
     year = {2010},
     mrnumber = {2667980},
     zbl = {1216.18002},
     language = {en},
     url = {http://archive.numdam.org/item/CTGDC_2010__51_2_127_0/}
}
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Clementino, Maria Manuel; Gutierres, Gonçalo. On regular and homological closure operators. Cahiers de Topologie et Géométrie Différentielle Catégoriques, Tome 51 (2010) no. 2, article  no. 3, 16 p. http://archive.numdam.org/item/CTGDC_2010__51_2_127_0/

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