Khanam, Rawshan Arra, et al. “A Controlled Trial of Noninvasive Positive Pressure Ventilation (NIPPV) in Patients of COPD With Respiratory Failure”.
Bangladesh Critical Care Journal
, vol. 1, no. 2, Dec. 2013, pp. 86-92, doi:10.3329/bccj.v1i2.17201.