Raju, B. M., Jotkar, S., M., P., Goswami, S., Dube, M. and Singh, A. (2018) “Effectiveness of non-invasive positive pressure ventilation for acute exacerbation of chronic obstructive pulmonary disease”, International Journal of Clinical Trials, 5(2), pp. 102–106. doi: 10.18203/2349-3259.ijct20181740.