@article{CTGDC_1987__28_2_143_0,
     author = {Ehrbar, Hans and Wyler, Oswald},
     title = {Images in categories as reflections},
     journal = {Cahiers de Topologie et G\'eom\'etrie Diff\'erentielle Cat\'egoriques},
     pages = {143--159},
     publisher = {Dunod \'editeur, publi\'e avec le concours du CNRS},
     volume = {28},
     number = {2},
     year = {1987},
     mrnumber = {913969},
     zbl = {0632.18001},
     language = {en},
     url = {http://archive.numdam.org/item/CTGDC_1987__28_2_143_0/}
}