Patel, S. M., G. P. Nair, B. G. Tuppekar, and A. G. Uppe. “Effectiveness of Non-Invasive Ventilation in Patients With Type 2 Respiratory Failure”. International Journal of Research in Medical Sciences, vol. 9, no. 3, Feb. 2021, pp. 794-7, doi:10.18203/2320-6012.ijrms20210880.