@article{Li2004,
  author    = {{Li, Xiao Chun}},
  title     = {{Same-flowing numbers and super contraction iteration in $3N+1$ conjecture}},
  journal   = {{J. Huazhong Univ. Sci. Technol. Nat. Sci.}},
  year      = {{2004}},
  volume    = {{32}},
  number    = {{10}},
  pages     = {{30--32}},
}