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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. 2016, No. 31, 10-17. https://doi.org/10.26565/2227-6505-2016-31-02.