@article{CMUC_1969__10_2_a14,
     author = {Trnkov\'a, V\v{e}ra},
     title = {Some properties of set functors},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {323--352},
     publisher = {mathdoc},
     volume = {10},
     number = {2},
     year = {1969},
     mrnumber = {0252474},
     zbl = {0183.30401},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1969__10_2_a14/}
}