@article{CammarotoChinni2002LeMatematiche,
  author  = {Filippo Cammaroto and Antonia Chinnì},
  title   = {A Liouville-Type Theorem for the Homogeneous Wave Equation},
  journal = {Le Matematiche},
  volume  = {LVII},
  number  = {1},
  pages   = {167--170},
  year    = {2002}
}