@article{Wu1995,
  author    = {{Wu, Jia Bang}},
  title     = {{The monotonicity of pairs of coalescence numbers in the Collatz
problem}},
  journal   = {{J. Huazhong Univ. Sci. Tech. [Hua zhong gong xue yuan]}},
  year      = {{1995}},
  pages     = {{170--172}},
  note      = {{MR 1 403 509}},
}