Akhimienmhona, P. D.; Oreofe, A. B.; Belal, S. A. S.; Kulyk, V. L. 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, 53-58.