Dogra, A. C., Gupta, U., Sarkar, M., Padam, A., Chauhan, A., & Thakur, S. (2017). Six-minute walk work in patients with chronic obstructive pulmonary disease. International Journal of Research in Medical Sciences, 2(4), 1283–1288. Retrieved from https://www.msjonline.org/index.php/ijrms/article/view/2409