Hakman, A., O. Andrieieva, V. Kashuba, S. Duditska, P. Horiuk, I. Khrypko, Y. Tomilina, O. Kljus, and T. Lukashiv. “Influence of Physical Working Capacity on Quality of Life and Life Satisfaction in Old-Age Population of Ukraine”. Journal of Human Sport and Exercise, vol. 16, no. 2proc, Mar. 2021, pp. S202-S211, https://www.jhse.ua.es/article/view/2021-v16-n2-proc-influence-physical-working-capacity-quality-lif.