Sapkota, D., and Y. R. Amatya. “Assessment of Rotahaler Inhalation Technique Among Patients With Chronic Obstructive Pulmonary Disease in a Teaching Hospital of Nepal”. Journal of Kathmandu Medical College, vol. 5, no. 1, Sept. 2017, pp. 11-17, doi:10.3126/jkmc.v5i1.18259.