@article{JCA_2013_20_1_JCA_2013_20_1_a5,
     author = {M. V. Balashov},
     title = {Weak {Convexity} of the {Distance} {Function}},
     journal = {Journal of convex analysis},
     pages = {93--106},
     publisher = {mathdoc},
     volume = {20},
     number = {1},
     year = {2013},
     url = {http://geodesic.mathdoc.fr/item/JCA_2013_20_1_JCA_2013_20_1_a5/}
}