@article{CMUC_1971__12_2_a1,
     author = {Reiterman, Jan},
     title = {An example concerning set-functors},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {227--233},
     publisher = {mathdoc},
     volume = {12},
     number = {2},
     year = {1971},
     mrnumber = {0288067},
     zbl = {0231.18004},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1971__12_2_a1/}
}