@incollection{Lagarias1999,
  author    = {{Jeffrey C. Lagarias}},
  title     = {{How random are 3x + 1 function iterates?}},
  booktitle = {{The Mathemagician and Pied Puzzler: A Collection in Tribute to Martin Gardner}},
  publisher = {{A. K. Peters, Ltd.: Natick, Mass.}},
  year      = {{1999}},
  pages     = {{253--266}},
}