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@article{MAN_1981__257_163555, author = {Victor Klee}, title = {Dispersed {Chebyshev} {Sets} and {Coverings} by {Balls.}}, journal = {Mathematische Annalen}, pages = {251--260}, publisher = {mathdoc}, volume = {257}, year = {1981}, zbl = {0453.41021}, url = {http://geodesic.mathdoc.fr/item/MAN_1981__257_163555/} }
Victor Klee. Dispersed Chebyshev Sets and Coverings by Balls.. Mathematische Annalen, Tome 257 (1981), pp. 251-260. http://geodesic.mathdoc.fr/item/MAN_1981__257_163555/