@Article{ 
  KorKuuPal15,
  author = { Korvenpaa, Janne and Kuusi, Tuomo and Palatucci, Giampiero },
  title = { The obstacle problem for nonlinear integro-differential operators },
  journal = { Calc. Var. Partial Differential Equations },
  year = { 2016 },
  doi = { 10.1007/s00526-016-0999-2 },
  volume = { 55 },
  number = { 3 },
  pages = { Art. 63 },
  URL = { http://cvgmt.sns.it/paper/2870/ },
  note = { cvgmt preprint}
}