no. 4
The cartesian closed hull of the category of approach spaces
Cahiers de Topologie et Géométrie Différentielle Catégoriques, Tome 42 (2001) no. 4, pp. 242-260 
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     author = {Lowen-Colebunders, E. and Lowen, R. and Nauwelaerts, M.},
     title = {The cartesian closed hull of the category of approach spaces},
     journal = {Cahiers de Topologie et G\'eom\'etrie Diff\'erentielle Cat\'egoriques},
     pages = {242--260},
     year = {2001},
     publisher = {Dunod \'editeur, publi\'e avec le concours du CNRS},
     volume = {42},
     number = {4},
     mrnumber = {1876866},
     zbl = {0999.18006},
     language = {en},
     url = {https://www.numdam.org/item/CTGDC_2001__42_4_242_0/}
}
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Lowen-Colebunders, E.; Lowen, R.; Nauwelaerts, M. The cartesian closed hull of the category of approach spaces. Cahiers de Topologie et Géométrie Différentielle Catégoriques, Tome 42 (2001) no. 4, pp. 242-260. https://www.numdam.org/item/CTGDC_2001__42_4_242_0/

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