@article{MASLO_1967_17_4_a4,
     author = {Zn\'am, \v{S}tefan},
     title = {On $k${-Thin} {Sets} and $n${-Extensive} {Graphs}},
     journal = {Mathematica slovaca},
     pages = {297--307},
     year = {1967},
     volume = {17},
     number = {4},
     mrnumber = {0232699},
     zbl = {0173.01901},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/MASLO_1967_17_4_a4/}
}