@Misc{ 
  GarSpe14b,
  author = { Garg, Rahul and Spector, Daniel },
  title = { On the role of Riesz potentials in Poisson's equation and Sobolev embeddings },
  journal = { Indiana Univ. Math. J. },
  year = { 2014 },
  pages = { 21 },
  URL = { http://cvgmt.sns.it/paper/2407/ },
  note = { cvgmt preprint}
}