1. Worldmeter/coronavirus_updates (2020). https://www.worldometers.info/coronavirus/country/japan/
2. Bailey, N.T.J.: The Mathematical Theory of Infectious Diseases(Mathematics in Medicine series). Graffin, London (1975)
3. Li, M.Y.: An Introduction to Mathematical Modeling of Infectious Diseases (Mathematics of Planet Earth). Springer (2019)
4. Britton, T., Ball, F.: Stochastic Epidemic Models with Inference (Lecture Notes in Mathematics). Springer (2019)
5. Marchuk, G.I.: Mathematical Modeling of Immune Response in Infectious Diseases (Mathematics and Its Applications). Kluwer Academic Publishers (2019)