@article{CloneyGolesVichniac1987,
  author    = {{Thomas Cloney and Eric C. Goles and Gérard Y. Vichniac}},
  title     = {{The $3x  +  1$ Problem: a Quasi-Cellular Automaton}},
  journal   = {{Complex Systems}},
  year      = {{1987}},
  volume    = {{1}},
  pages     = {{349--360}},
  note      = {{MR 88d:68080}},
}