no. 4
On a mechanism of defining morphisms in concrete categories
Cahiers de Topologie et Géométrie Différentielle Catégoriques, Tome 13 (1972) no. 4, pp. 397-410. 
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     author = {Ku\v{c}era, L. and Pultr, Ale\v{s}},
     title = {On a mechanism of defining morphisms in concrete categories},
     journal = {Cahiers de Topologie et G\'eom\'etrie Diff\'erentielle Cat\'egoriques},
     pages = {397--410},
     publisher = {Dunod \'editeur, publi\'e avec le concours du CNRS},
     volume = {13},
     number = {4},
     year = {1972},
     zbl = {0275.18006},
     mrnumber = {393173},
     language = {en},
     url = {http://archive.numdam.org/item/CTGDC_1972__13_4_397_0/}
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Kučera, L.; Pultr, A. On a mechanism of defining morphisms in concrete categories. Cahiers de Topologie et Géométrie Différentielle Catégoriques, Tome 13 (1972) no. 4, pp. 397-410. http://archive.numdam.org/item/CTGDC_1972__13_4_397_0/

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