@article{ApplegateLagarias2003,
  author    = {{David Applegate and Jeffrey C. Lagarias}},
  title     = {{Lower bounds for the total stopping time  of $3x+1$ iterates}},
  journal   = {{Math. Comp.}},
  year      = {{2003}},
  volume    = {{72}},
  pages     = {{1035--1049}},
  note      = {{MR 2004a:11016}},
}