Ovod, A. I., I. G. Komissinskaya, and K. V. Khorlyakov. “Sociomedical Factors Affecting the Birth Rate in the Russian Federation”. Journal of the University of Zulia , Vol. 11, no. 30, July 2020, pp. 382-95, https://produccioncientifica.luz.edu.ve/index.php/rluz/article/view/32827.