@article{UrataHamada2005,
  author    = {{Toshio Urata and Kazuhiro Hamada}},
  title     = {{Positive values of a holomorphic function connected with the Collatz problem}},
  journal   = {{Bulletin Aichi Univ. Education (Natural Science)}},
  year      = {{2005}},
  volume    = {{54}},
  pages     = {{1--10}},
}