@article{10_21136_MB_1995_126001,
     author = {Kar\'asek, Ji\v{r}{\'\i}},
     title = {Projections of relations},
     journal = {Mathematica Bohemica},
     pages = {283--291},
     publisher = {mathdoc},
     volume = {120},
     number = {3},
     year = {1995},
     doi = {10.21136/MB.1995.126001},
     mrnumber = {1369686},
     zbl = {0849.04001},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/MB.1995.126001/}
}