@article{CMUC_1991__32_2_a22,
     author = {Sun, Shu-Hao and Choo, Koo-Guan},
     title = {New properties of the concentric circle space and its applications to cardinal inequalities},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {395--403},
     publisher = {mathdoc},
     volume = {32},
     number = {2},
     year = {1991},
     mrnumber = {1137802},
     zbl = {0772.54004},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1991__32_2_a22/}
}