@Article{ framan97, author = { FragalĂ , Ilaria and Mantegazza, Carlo }, title = { On some Notions of Tangent Space to a Measure }, journal = { Proc. Royal Soc. Edinburgh }, year = { 1999 }, volume = { 129A }, pages = { 331-342 }, URL = { http://cvgmt.sns.it/paper/375/ }, note = { cvgmt preprint} }