1. Tymoshenko O.S., Yabluchansky M.I., Martynenko O.V. 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". 2017. № 34. C. 47-50.