@article{CMUC_1970__11_1_a5,
     author = {Zem\'anek, Jaroslav},
     title = {Nowhere dense set which is finitely open},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {83--89},
     publisher = {mathdoc},
     volume = {11},
     number = {1},
     year = {1970},
     mrnumber = {0261329},
     zbl = {0195.40904},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1970__11_1_a5/}
}