“Impact of Elective Percutaneous Transluminal Coronary Angioplasty (PTCA) on Heart Rate Variability in Patients With Coronary Artery Disease”. International Journal of Physiology 8, no. 3 (July 22, 2020): 12–16. Accessed May 20, 2026. https://www.ijop.net/index.php/ijop/article/view/1322.