@article{Chamberland2003,
  author    = {{Mark Chamberland}},
  title     = {{Una actualizachio del problema $3x+1$}},
  journal   = {{Butletti de la Societat Catalana}},
  year      = {{2003}},
  volume    = {{22}},
  pages     = {{19--45}},
  note      = {{MR 2004i:11019}},
}