Vieira, D. S. R., França, D. C., Pereira, D. A. G., Sampaio, R. F., Britto, R. R., & Parreira, V. F. (2015). Length of exercise training in COPD: a single-subject design. Journal of Respiratory and CardioVascular Physical Therapy, 2(2), 42–51. Retrieved from https://periodicos.ufrn.br/revistadefisioterapia/article/view/6036