@article{ARM_1987__23_2_a7,
     author = {Rosick\'y, Ji\v{r}{\'\i}},
     title = {A categorical characterization of sets among classes},
     journal = {Archivum mathematicum},
     pages = {117--119},
     publisher = {mathdoc},
     volume = {23},
     number = {2},
     year = {1987},
     mrnumber = {930328},
     zbl = {0632.18003},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ARM_1987__23_2_a7/}
}