@article{Brox2000,
  author    = {{Thomas Brox}},
  title     = {{Collatz cycles with few descents}},
  journal   = {{Acta Arithmetica}},
  year      = {{2000}},
  volume    = {{92}},
  pages     = {{181--188}},
  note      = {{MR 2001a:11032}},
}