1. Ya. B. Zel’dovich, Selected Works, Vol. 1 [in Russian], Nauka, Moscow (1984).
2. A. N. Kolmogorov, I. G. Petrovskii, and N. S. Piskunov, Investigation into the equation of diffusion combined with the substance growth and its application to one biological problem, Byull. MGU, Ser. A, Mat. Mekh., 1, No. 6, 1–26 (1937).
3. A. M. Nakhushev, Equations of Mathematical Biology [in Russian], Vysshaya Shkola, Moscow (1995).
4. R. Pastor-Satorras, C. Castellano, P. Van Mieghem, and A. Vespignani, Epidemic processes in complex networks, Rev. Mod. Phys., 87, 925 (2015).
5. P. S. Grinchuk and S. P. Fisenko, Two Waves in the Dynamics of Coronavirus Rate in the Republic of Belarus, Preprint; DOI: 10.24108/preprints-3112048.