@article{CMUC_1972__13_4_a9,
     author = {Tich\'y, Tom\'a\v{s} and Vin\'arek, Ji\v{r}{\'\i}},
     title = {On the algebraic characterization of systems of $1-1$ partial mappings},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {711--720},
     publisher = {mathdoc},
     volume = {13},
     number = {4},
     year = {1972},
     mrnumber = {0314732},
     zbl = {0252.20067},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1972__13_4_a9/}
}