@Misc{ 
  LiuLu19,
  author = { Liu, Pan and Lu, Xin Yang },
  title = { Real order (an)-isotropic total variation in image processing - Part II:  Learning of optimal structures },
  journal = {  },
  year = { 2019 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/4288/ },
  note = { cvgmt preprint}
}