Garg, A., S. kumar Goyal, and D. Biswas. “Chronic Smoking, a Cause for Development of Peripheral Neuropathy in Chronic Obstructive Pulmonary Disease: Chronic Smoking, a Cause for Development”. National Journal of Integrated Research in Medicine, vol. 5, no. 6, Dec. 2014, pp. 1-6, http://nicpd.ac.in/ojs-/index.php/njirm/article/view/818.