@article{CMUC_1971__12_4_a1,
     author = {Vlach, Milan},
     title = {A separation theorem for finite families},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {655--660},
     publisher = {mathdoc},
     volume = {12},
     number = {4},
     year = {1971},
     mrnumber = {0290126},
     zbl = {0229.52008},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1971__12_4_a1/}
}