O. S. Tymoshenko and M. I. Yabluchansky, “DINAMICS OF BLOOD PRESSURE AND HEART RATE VARIABILITY PARAMETERS DURING BIOFEEDBACK IN LOOP OF HEART RATE VARIABILITY AND PACED BREATHING IN PATIENTS WITH DIFFICULT-TO-CONTROL ARTERIAL HYPERTENSION ON THE BACKGROUND OF DRUG”, J. V. N. Karazin Khark. Nat. Univ., Ser. Med., no. 33, pp. 40-44, Sep. 2017.