@inproceedings{ClarkLewis1995,
  author    = {{Dean Clark and James T. Lewis}},
  title     = {{A Collatz-Type Difference Equation}},
  booktitle = {{Proc. Twenty-sixth Internationsal Conference on Combinatorics, Graph Theory and Computing (Boca Raton 1995)}},
  year      = {{1995}},
  volume    = {{111}},
  pages     = {{129--135}},
  note      = {{MR 98b:11008}},
}