@article{bwmeta1.element.bwnjournal-article-doi-10_4064-aa109-3-4,
author = {Ilia Krasikov and Jeffrey C. Lagarias},
title = {Bounds for the 3x+1 problem using difference inequalities},
journal = {Acta Arithmetica},
volume = {108},
year = {2003},
pages = {237-258},
zbl = {1069.11011},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-aa109-3-4}
}
Ilia Krasikov; Jeffrey C. Lagarias. Bounds for the 3x+1 problem using difference inequalities. Acta Arithmetica, Tome 108 (2003) pp. 237-258. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-aa109-3-4/