@article{JCA_2011_18_4_JCA_2011_18_4_a2,
     author = {A. Lemenant},
     title = {About the {Regularity} of {Average} {Distance} {Minimizers} in {R\protect\textsuperscript{2}}},
     journal = {Journal of convex analysis},
     pages = {949--981},
     publisher = {mathdoc},
     volume = {18},
     number = {4},
     year = {2011},
     url = {http://geodesic.mathdoc.fr/item/JCA_2011_18_4_JCA_2011_18_4_a2/}
}