@article{Stolarsky1998,
  author    = {{Kenneth S. Stolarsky}},
  title     = {{A prelude to the $3x+1$ problem}},
  journal   = {{J. Difference Equations and Applications}},
  year      = {{1998}},
  volume    = {{4}},
  pages     = {{451--461}},
  note      = {{MR 99k:11037}},
}