@article{Cadogan1996,
  author    = {{Charles  C. Cadogan}},
  title     = {{Exploring the $3x+1$ problem I}},
  journal   = {{Caribbean J. Math. Comput. Sci.}},
  year      = {{1996}},
  volume    = {{6}},
  pages     = {{10--18}},
  note      = {{MR 2001k:11032}},
}