Pisaruk, Anatoly, Ludmila Mekhova, Ivanna Antoniuk-Shcheglova, Ludmila Pisaruk, Nataly Koshel, and Stefan Ivanov. “Estimating Biological Age of the Autonomic Regulation Cardio-Vascular System ”. Ageing and longevity 3, no. 1 (February 23, 2022): 1-7. Accessed March 31, 2023. http://aging-longevity.org.ua/index.php/journal-description/article/view/42.