@Misc{ 
  Lu13b,
  author = { Lu, Xin Yang },
  title = { Example of minimizer of the average distance problem with non closed set of corners },
  journal = { Rend. Sem. Mat. Univ. Padova },
  year = { 2015 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/2305/ },
  note = { cvgmt preprint}
}