@article{Barone1999,
  author    = {{Enzo Barone}},
  title     = {{A heuristic probabilistic argument for the Collatz sequence}},
  journal   = {{Ital. J. Pure Appl. Math.}},
  year      = {{1999}},
  volume    = {{4}},
  pages     = {{151--153}},
  note      = {{MR 2000d:11033}},
}