@article{Venturini1997,
  author    = {{Giovanni Venturini}},
  title     = {{On a Generalization of the $3x + 1$ problem}},
  journal   = {{Adv. Appl. Math.}},
  year      = {{1997}},
  volume    = {{19}},
  pages     = {{295--305}},
  note      = {{MR 98j:11013}},
}