Tymoshenko, O. S., M. I. Yabluchansky, and O. V. Martynenko. “CHARACTERISTIC OF PARAMETERS OF HEART RATE VARIABILITY IN PATIENTS WITH DIFFICULT-TO-CONTROL AND CONTROLLED ARTERIAL HYPERTENSION”. The Journal of V. N. Karazin Kharkiv National University, Series "Medicine", no. 34, Dec. 2017, pp. 47-50, https://periodicals.karazin.ua/medicine/article/view/10039.