@article{CMUC_1977__18_1_a12,
     author = {Koubek, V\'aclav},
     title = {Graphs with given subgraphs represent all categories},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {115--127},
     publisher = {mathdoc},
     volume = {18},
     number = {1},
     year = {1977},
     mrnumber = {0457276},
     zbl = {0355.18006},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1977__18_1_a12/}
}