Altindag, O., M. Uyar, M. Serdar Akaltun, S. Gursoy, and A. Gur. “Impact of Pulmonary Rehabilitation Program With Cycle Ergometry in Chronic Obstructive Pulmonary Disease”. Annals of Medical Research, vol. 28, no. 1, May 2021, pp. 0172-7, http://www.annalsmedres.org/index.php/aomr/article/view/333.