“CLINICO-PHYSIOLOGIC SIGNIFICANCE OF HEART RATE VARIABILITY IN CHRONIC ISCHEMIC HEART DISEASE”, J. V. N. Karazin Khark. Nat. Univ., Ser. Med., no. 3, pp. 59–80, Jul. 2015, Accessed: Oct. 26, 2026. Available: https://periodicals.karazin.ua/medicine/article/view/7381