@Article{ 
  LiLiu15,
  author = { Li, Yi and Liu, Kefeng },
  title = {  A geometric heat flow for vector fields },
  journal = { Science China Mathematics },
  year = { 2015 },
  doi = { 10.1007/s11425-014-4926-8 },
  volume = { 58 },
  number = { 4 },
  pages = { 673-688 },
  URL = { http://cvgmt.sns.it/paper/3279/ },
  note = { cvgmt preprint}
}