@article{CMUC_1971__12_2_a14,
     author = {Ku\v{c}era, Lud\v{e}k},
     title = {A shrinking of a category of societies is a universal partly ordered class},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {401--411},
     publisher = {mathdoc},
     volume = {12},
     number = {2},
     year = {1971},
     mrnumber = {0289393},
     zbl = {0234.18005},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1971__12_2_a14/}
}