Kumar, A., A. Rohira, A. Vijay, and A. Sharma. “Multi Detector Computed Tomography Evaluation in Chronic Obstructive Pulmonary Disease and Correlation With Severity of Disease”. International Journal of Research in Medical Sciences, vol. 7, no. 8, July 2019, pp. 3116-20, doi:10.18203/2320-6012.ijrms20193404.