@article{JCA_2014_21_4_JCA_2014_21_4_a2,
     author = {M. V. Balashov and M. O. Golubev},
     title = {Weak {Concavity} of the {Antidistance} {Function}},
     journal = {Journal of convex analysis},
     pages = {951--964},
     publisher = {mathdoc},
     volume = {21},
     number = {4},
     year = {2014},
     url = {http://geodesic.mathdoc.fr/item/JCA_2014_21_4_JCA_2014_21_4_a2/}
}