Jeffrey C. Lagarias. Erdős, Klarner, and the 3x + 1 Problem. The American Mathematical Monthly, 123(8):753-776, 2016. [doi]
@article{Lagarias16,
title = {Erdős, Klarner, and the 3x + 1 Problem},
author = {Jeffrey C. Lagarias},
year = {2016},
url = {https://www.tandfonline.com/doi/abs/10.4169/amer.math.monthly.123.08.753},
researchr = {https://researchr.org/publication/Lagarias16},
cites = {0},
citedby = {0},
journal = {The American Mathematical Monthly},
volume = {123},
number = {8},
pages = {753-776},
}