Sergey Belyakin, and Sergey Shuteev. “Dynamics of Infected Active and Uninfected Active Populations Leading to Pandemics by Using a Discrete Model of Two Interacting Pacemakers”. New Trends in Physical Science Research Vol. 1, Apr. 2022, pp. 153-61, doi:10.9734/bpi/ntpsr/v1/15753D.