@article{articlef034e115,
title   = {Bass units as free factors in integral group rings of simple groups},
author = {Gonçalves, Jairo Zacarias and Guralnick, Robert M and del Rio, Angel},
year = {2014},
doi = {10.1016/j.jalgebra.2013.12.024},
journal   = {Journal of Algebra}
}