Chandravanshi, S., M. Khande, M. K. Sharma, D. P. Lakra, and R. K. Panda. “Prevalence of Asthma Chronic Obstructive Pulmonary Disease Overlap in Patients Attending a Tertiary Health Care Centre”. International Journal of Advances in Medicine, vol. 8, no. 8, July 2021, pp. 1154-9, doi:10.18203/2349-3933.ijam20212859.