@article{Kuttler1994,
  author    = {{James R. Kuttler}},
  title     = {{On the $3x+1$ Problem}},
  journal   = {{Adv. Appl. Math.}},
  year      = {{1994}},
  volume    = {{15}},
  pages     = {{183--185}},
  note      = {{Zbl. 803.11018}},
}