@Misc{ 
  Han15,
  author = { Han, Bangxian },
  title = {  Ricci tensor on ${\rm RCD}^*(K, N)$ spaces },
  journal = { The Journal of Geometric Analysis },
  year = { 2017 },
  doi = { 10.1007/s12220-017-9863-7 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/2866/ },
  note = { cvgmt preprint}
}