@article{GluckTaylor2002,
  author    = {{David Gluck and Brian D. Taylor}},
  title     = {{A new statistic for the $3x+1$ problem}},
  journal   = {{Proc. Amer. Math. Soc.}},
  year      = {{2002}},
  volume    = {{130}},
  pages     = {{1293--1301}},
  note      = {{MR 2002k:11031}},
}