@article{article02728aa9,
title   = {Hyperbolicity of semigroup algebras},
author = {Iwaki, Edson and Juriaans, Orlando Stanley and Souza Filho, Antônio Calixto de},
year = {2008},
doi = {10.1016/j.jalgebra.2008.03.015},
journal   = {Journal of Algebra}
}