@article{CMUC_2011__52_1_a10,
     author = {Alirio J. Pe\~na, P. and Vielma, Jorge},
     title = {Isolated points and redundancy},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {145--152},
     publisher = {mathdoc},
     volume = {52},
     number = {1},
     year = {2011},
     mrnumber = {2828365},
     zbl = {1240.54106},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_2011__52_1_a10/}
}