A comparision of the acapella and a threshold inspiratory muscle trainer for sputum clearance in bronchiectasis

Naraparaju S et al. Physiotherapy Theory and Practice; 26(6):353-357 2010


Performance Comparison of Two Oscillating Positive Expiratory Pressure Devices: Acapella Vs Flutter

Volsko TA, DiFiore J, Chatburn RL Respir Care;48(2):124–30 2003


Use of an oscillating PEP device to enhance bronchial hygiene in a patient of post N1N1 pnuemonia and accute respiratory distree syndrome with pneumothorax

Deepali Narula, Vivek nangia BMJ Case Rep 2014. doi:10.1136/bcr-2013-202598 2014