@Article{ ManMasUra13, author = { Mantegazza, Carlo and Mascellani, Giovanni and Uraltsev, Gennady }, title = { On the Distributional Hessian of the Distance Function }, journal = { Pacific J. of Math. }, year = { 2014 }, doi = { 10.2140/pjm.2014.270.151 }, volume = { 270 }, pages = { 151-166 }, URL = { http://cvgmt.sns.it/paper/2113/ }, note = { cvgmt preprint} }