Ovod , A. I., T. A. Oleynikova, T. I. Urusova, T. V. Reztsova, V. O. Ulyanov, and O. V. Menshikova. “Variations in Indicators of the Health Sector and the Pharmaceutical Market in Russia During 2020”. Journal of the University of Zulia , Vol. 12, no. 33, May 2021, pp. 349-63, doi:10.46925//rdluz.33.25.