@article{OhiraYamashita2004,
  author    = {{Reiko Ohira and Michinori Yamashita}},
  title     = {{A Generalization of the Collatz problem}},
  journal   = {{PC Literacy [Pasocon Literacy] (Personal Computer Users Application Technology Association]}},
  year      = {{2004}},
  volume    = {{31}},
  number    = {{4}},
  pages     = {{16--21}},
}