@article{1181069319,
author = {Brown, Ron and Merzel, Jonathan L.},
title = {The Length of Ducci's Four-Number Game},
journal = {Rocky Mountain J. Math.},
volume = {37},
number = {2},
year = {2007},
pages = { 45-65},
language = {en},
url = {http://dml.mathdoc.fr/item/1181069319}
}
Brown, Ron; Merzel, Jonathan L. The Length of Ducci's Four-Number Game. Rocky Mountain J. Math., Tome 37 (2007) no. 2, pp. 45-65. http://gdmltest.u-ga.fr/item/1181069319/