@Misc{ 
  Cri15a,
  author = { Cristoferi, Riccardo },
  title = { On local and global minimizers of some non-convex variational problems },
  journal = {  },
  year = { 2015 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/2809/ },
  note = { cvgmt preprint}
}