@article{EXMATH_2004_2004_1_a26,
     author = {Papini, Pier Luigi},
     title = {Conjuntos equil\'ateros, diametrales, centrados y subconjuntos de esferas.},
     journal = {Extracta mathematicae},
     pages = {261-267},
     publisher = {mathdoc},
     volume = {19},
     number = {2},
     year = {2004},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EXMATH_2004_2004_1_a26/}
}