@article{MM2_1989__63_3_155372,
     author = {Jia-ping Wang and Xin-tai Yu},
     title = {Chebyshev centers, {E-Chebyshev} centers and the {Hausdorff} metric.},
     journal = {Manuscripta mathematica},
     pages = {115--128},
     publisher = {mathdoc},
     volume = {63},
     number = {3},
     year = {1989},
     zbl = {0675.41042},
     url = {http://geodesic.mathdoc.fr/item/MM2_1989__63_3_155372/}
}