On a mechanism of defining morphisms in concrete categories
Cahiers de Topologie et Géométrie Différentielle Catégoriques, Volume 13 (1972) no. 4, p. 397-410 
@article{CTGDC_1972__13_4_397_0,
     author = {Ku\v cera, 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},
     publisher = {Dunod \'editeur, publi\'e avec le concours du CNRS},
     volume = {13},
     number = {4},
     year = {1972},
     pages = {397-410},
     zbl = {0275.18006},
     mrnumber = {393173},
     language = {en},
     url = {http://www.numdam.org/item/CTGDC_1972__13_4_397_0}
}

Kučera, L.; Pultr, A. On a mechanism of defining morphisms in concrete categories. Cahiers de Topologie et Géométrie Différentielle Catégoriques, Volume 13 (1972) no. 4, pp. 397-410. http://www.numdam.org/item/CTGDC_1972__13_4_397_0/

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