@article{Yamashita2002,
  author    = {{Yamashita, Michinori}},
  title     = {{$3x+1$ problem from the $(e,k)$-perspective}},
  journal   = {{PC Literacy}},
  year      = {{2002}},
  volume    = {{27}},
  number    = {{10}},
  pages     = {{22--27}},
}