Panina, Lyubov, Svitlana Kovalchuk, and Oksana Terletska. 2010. “Heart Rate Variability Analysis (HRV) under the Influence of Atropine and Propranolol”. Current Issues in Pharmacy and Medical Sciences 23 (4): 201-6. https://czasopisma.umlub.pl/curipms/article/view/2962.