@Article{ 
  ComSte18,
  author = { Comi, Giovanni Eugenio and Stefani, Giorgio },
  title = { A distributional approach to fractional Sobolev spaces and fractional variation: existence of blow-up },
  journal = { Journal of Functional Analysis },
  year = { 2019 },
  doi = { 10.1016/j.jfa.2019.03.011 },
  volume = { 277 },
  number = { 10 },
  pages = { 3373-3435 },
  URL = { http://cvgmt.sns.it/paper/4054/ },
  note = { cvgmt preprint}
}