Daminov B.T., Shamukhamedova N.Sh., Kadirova G.G., and Abrorova B.T. “Assessment of Heart Rate Variability With COPD Associated With Pulmonary and Arterial Hypertension”. International Journal of Medical Sciences And Clinical Research 6, no. 04 (April 20, 2026): 74–77. Accessed August 16, 2026. https://theusajournals.com/index.php/ijmscr/article/view/10038.