@Article{ 
  BoLeNoOr20,
  author = { Bonafini, Mauro and Le, Van Phu Cuong and Novaga, Matteo and Orlandi, Giandomenico },
  title = { On the obstacle problem for fractional semilinear wave equations },
  journal = { Nonlinear Analysis },
  year = { 2021 },
  volume = { 210 },
  number = { 112368 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/4867/ },
  note = { cvgmt preprint}
}