@article{article2ab659e7,
title   = {Hyperbolic unit groups},
author = {Juriaans, Orlando Stanley and Passi, Inder Bir S. and Prasad, Diprenda},
year = {2005},
doi = {10.1090/S0002-9939-04-07578-1},
journal   = {Proceedings of the American Mathematical Society, Providence}
}