@Article{ 
  TenTil17,
  author = { Tentarelli, Lorenzo and Tilli, Paolo },
  title = { De Giorgi's approach to hyperbolic Cauchy problems: the case of  nonhomogeneous equations },
  journal = { Comm. Partial Differential Equations },
  year = { 2018 },
  doi = { 10.1080/03605302.2018.1459686 },
  volume = { 43 },
  number = { 4 },
  pages = { 677-698 },
  URL = { http://cvgmt.sns.it/paper/5627/ },
  note = { cvgmt preprint}
}