@article{Zhou1997,
  author    = {{Zhou, Chuan Zhong}},
  title     = {{Some recurrence relations connected with the $3x+1$ problem}},
  journal   = {{J. South China Normal Univ.  Natur. Sci. Ed.
[Hua nan shi fan da xue xue bao. Zi ran ke xue ban]}},
  year      = {{1997}},
  pages     = {{7--8}},
}