@article{UrataKajita1998,
  author    = {{Toshio Urata and Hisao Kajita}},
  title     = {{Collatz Problem III}},
  journal   = {{Epsilon (The Bulletin of the Society of Mathematics Education of Aichi Univ. of Education) [Aichi Kyoiku Daigaku Sugaku Kyoiku Gakkai shi]}},
  year      = {{1998}},
  volume    = {{40}},
  pages     = {{57--65}},
}