Dhillon, Sukhjinder Kaur, Narinder Kaur, Dimple Bajaj Arora, and Parminder Sandhu. 2018. “CHANGES IN SYMPATHETIC ACTIVITY IN PATIENTS OF CHRONIC OBSTRUCTIVE PULMONARY DISEASE”. Pakistan Journal of Physiology 12 (4):9-11. https://pjp.pps.org.pk/index.php/PJP/article/view/619.