@article{articlec759047c,
title   = {Effects of singing classes on pulmonary function and quality of life of COPD patients},
author = {Bonilha, Amanda Gimenes and Onofre, Fernanda and Vieira, Maria Lucia and Prado, Maria Yuka de Almeida and Martinez, José Antônio Baddini},
year = {2009},
journal   = {International Journal of Chronic Obstructive Pulmonary Disease}
}