no. 4
Orthogonality and closure operators
Cahiers de Topologie et Géométrie Différentielle Catégoriques, Tome 36 (1995) no. 4, pp. 323-343 
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     author = {Sousa, Lurdes},
     title = {Orthogonality and closure operators},
     journal = {Cahiers de Topologie et G\'eom\'etrie Diff\'erentielle Cat\'egoriques},
     pages = {323--343},
     year = {1995},
     publisher = {Dunod \'editeur, publi\'e avec le concours du CNRS},
     volume = {36},
     number = {4},
     mrnumber = {1367590},
     zbl = {0842.18001},
     language = {en},
     url = {https://www.numdam.org/item/CTGDC_1995__36_4_323_0/}
}
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Sousa, Lurdes. Orthogonality and closure operators. Cahiers de Topologie et Géométrie Différentielle Catégoriques, Tome 36 (1995) no. 4, pp. 323-343. https://www.numdam.org/item/CTGDC_1995__36_4_323_0/

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