@article{MatthewsWatts1984,
  author    = {{Keith R. Matthews and Anthony M. Watts}},
  title     = {{A generalization of Hasse's generalization of the Syracuse algorithm}},
  journal   = {{Acta. Arithmetica}},
  year      = {{1984}},
  volume    = {{43}},
  pages     = {{167--175}},
  note      = {{MR 85i:11068}},
}