Raza, Ahmad, Mahmood Iqbal Malik, and Yousaf Jamal. “COMPARISON OF NIPPV WITH STANDARD TREATMENT IN PATIENTS WITH ACUTE EXACERBATIONS OF COPD IN TERMS OF IMPROVEMENT IN ABGS AND HOSPITAL STAY: COPD and Hospital Stay”. Pakistan Armed Forces Medical Journal 64, no. 1 (March 31, 2014): 46–50. Accessed May 14, 2024. https://www.pafmj.org/PAFMJ/article/view/528.