@article{GDZPPN002229501,
title = {Chebyshev centers, E-Chebyshev centers and the Hausdorff metric.},
journal = {Manuscripta mathematica},
volume = {64},
year = {1989},
pages = {115-128},
zbl = {0675.41042},
url = {http://dml.mathdoc.fr/item/GDZPPN002229501}
}
Wang, Jia-ping; Yu, Xin-tai. Chebyshev centers, E-Chebyshev centers and the Hausdorff metric.. Manuscripta mathematica, Tome 64 (1989) pp. 115-128. http://gdmltest.u-ga.fr/item/GDZPPN002229501/