@article{Pan2000,
  author    = {{Pan, Hong-liang}},
  title     = {{Notes on the $3x+1$ problem}},
  journal   = {{Journal of Suzhou University, Natural Science [Suzhou da xue xue bao. Zi ran ke xue ban]}},
  year      = {{2000}},
  volume    = {{16}},
  number    = {{4}},
  pages     = {{13--16}},
}