@article{CMUC_2003_44_4_a11,
     author = {Reich, Simeon and Zaslavski, Alexander J.},
     title = {Best approximations and porous sets},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {681--689},
     year = {2003},
     volume = {44},
     number = {4},
     mrnumber = {2062884},
     zbl = {1096.41022},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_2003_44_4_a11/}
}