Pokhrel, B.R., Chatopadhyaya, S. and Paudel, B.H. 2012. Peripheral Airway Responsiveness to Sub-maximal Exercise in Asymptomatic Cigarette Smokers. Kathmandu University Medical Journal. 9, 3 (Jun. 2012), 159–164. DOI:https://doi.org/10.3126/kumj.v9i3.6295.