@Misc{ 
  gig09,
  author = { Gigli, Nicola },
  title = { Second order analysis on (P_2(M),W_2) },
  journal = { Memoirs of the American Mathematical Society },
  year = { 2009 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/1274/ },
  note = { cvgmt preprint}
}