EFFECTIVENESS OF BIOFEEDBACK IN A CLOSED LOOP OF HEART RATE VARIABILITY PARAMETERS AND PACED BREATHING IN PATIENTS WITH ARTERIAL HYPERTENSION IN REAL CLINICAL PRACTICE. J. V. N. Karazin Khark. Nat. Univ., Ser. Med. 2015;(29):53-58. дата звернення Жовтень 25, 2026. https://periodicals.karazin.ua/medicine/article/view/3735