@article{Konstadinidis2006,
  author    = {{Pavlos B. Konstadinidis}},
  title     = {{The real $3x+1$ problem}},
  journal   = {{Acta Arithmetica}},
  year      = {{2006}},
  volume    = {{122}},
  pages     = {{35--44}},
  note      = {{MR 2007c:11029}},
}