@article{CTGDC_1972__13_4_397_0,
     author = {Ku\v{c}era, L. and Pultr, A.},
     title = {On a mechanism of defining morphisms in concrete categories},
     journal = {Cahiers de topologie et g\'eom\'etrie diff\'erentielle},
     pages = {397--410},
     publisher = {Dunod \'editeur, publi\'e avec le concours du CNRS},
     volume = {13},
     number = {4},
     year = {1972},
     mrnumber = {393173},
     zbl = {0275.18006},
     language = {en},
     url = {http://www.numdam.org/item/CTGDC_1972__13_4_397_0/}
}