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“ASSESSMENT OF CHANGES IN THE DISTRIBUTION RATIOS OF ULTRA-LOW-FREQUENCY, LOW-FREQUENCY AND HIGH-FREQUENCY COMPONENTS OF HEART RATE VARIABILITY DURING THE PACED BREATHING TEST IN PATIENTS WITH ARTERIAL HYPERTENSION”, J. V. N. Karazin Khark. Nat. Univ., Ser. Med., no. 31, pp. 10–17, Nov. 2016, doi: 10.26565/2227-6505-2016-31-02.