Pisaruk, A., L. Mekhova, I. Antoniuk-Shcheglova, L. Pisaruk, N. Koshel, and S. Ivanov. “Estimating Biological Age of the Autonomic Regulation Cardio-Vascular System ”. Ageing and Longevity, Vol. 3, no. 1, Feb. 2022, pp. 1-7, http://aging-longevity.org.ua/index.php/journal-description/article/view/42.