@article{Simons2008a,
  author    = {{John L. Simons}},
  title     = {{Exotic Collatz Cycles}},
  journal   = {{Acta Arithmetica}},
  year      = {{2008}},
  volume    = {{134}},
  pages     = {{201--209}},
  note      = {{MR 2438845}},
}