@Misc{ 
  GarMon13,
  author = { Garofalo, Nicola and Mondino, Andrea },
  title = { Li-Yau and Harnack type inequalities in $RCD^*(K,N)$ metric measure spaces },
  journal = { Nonlinear Analysis TMA },
  year = { 2013 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/2162/ },
  note = { cvgmt preprint}
}