“TYPE OF REACTION OF SIMPATO-VAGAL BALANCE IN A ACUTE FARM TEST WITH A METOPROLOL AND EFFICIENCY OF THERAPY OF HEART FAILURE”. The Journal of V. N. Karazin Kharkiv National University, Series "Medicine", no. 4, July 2015, pp. 14-17, https://periodicals.karazin.ua/medicine/article/view/7340.