@Article{ 
  ManRim12,
  author = { Mantegazza, Carlo and Mongodi, Samuele and Rimoldi, Michele },
  title = { The Cotton Tensor and the Ricci Flow },
  journal = { Geometric Flows },
  year = { 2017 },
  volume = { 2 },
  pages = { 49-71 },
  URL = { http://cvgmt.sns.it/paper/1809/ },
  note = { cvgmt preprint}
}