@article{AndreiMasalagiu1998,
  author    = {{Stefan Andrei and Cristian  Masalagiu}},
  title     = {{About the Collatz Conjecture}},
  journal   = {{Acta Informatica}},
  year      = {{1998}},
  volume    = {{35}},
  pages     = {{167--179}},
  note      = {{MR 99d:68097}},
}