@article{bwmeta1.element.bwnjournal-article-aav56i1p33bwm,
author = {Lagarias, Jeffrey},
title = {The set of rational cycles for the 3x+1 problem},
journal = {Acta Arithmetica},
volume = {55},
year = {1990},
pages = {33-53},
zbl = {0773.11017},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-aav56i1p33bwm}
}
Lagarias, Jeffrey. The set of rational cycles for the 3x+1 problem. Acta Arithmetica, Tome 55 (1990) pp. 33-53. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-aav56i1p33bwm/