Comparison of Acapella TM Versus Flutter for Airway Clearance In COPD Patients – A Cross Over Trial. VIMS Health Science Journal, [S. l.], v. 3, n. 2, p. 47–49, 2016. Disponível em: https://www.vimshsj.edu.in/index.php/main/article/view/133. Acesso em: 15 jun. 2026.