@Article{ 
  Xia8a,
  author = { Xia, Qinglan },
  title = { The geodesic problem in quasimetric spaces },
  journal = { Journal of Geometric Analysis },
  year = { 2009 },
  volume = { 19 },
  number = { 2 },
  pages = { 452-479 },
  URL = { http://cvgmt.sns.it/paper/5250/ },
  note = { cvgmt preprint}
}