@article{MAN_1961__142_160833,
     author = {V. KLEE},
     title = {Convexity of {Chebyshev} {Sets.}},
     journal = {Mathematische Annalen},
     pages = {292--304},
     year = {1961},
     volume = {142},
     zbl = {0091.27701},
     url = {http://geodesic.mathdoc.fr/item/MAN_1961__142_160833/}
}