L. Panina, S. Kovalchuk, and O. Terletska, “Heart rate variability analysis (HRV) under the influence of atropine and propranolol”, Curr. Issues Pharm. Med. Sci., vol. 23, no. 4, pp. 201–206, Dec. 2010, Accessed: Sep. 05, 2025. [Online]. Available: https://czasopisma.umlub.pl/curipms/article/view/2962