Kayral, Ä°hsan E., and S. Buzrul. “Forecasting of COVID-19 Infections in E7 Countries and Proposing Some Policies Based on the Stringency Index”. Journal of Population Therapeutics and Clinical Pharmacology, vol. 27, no. SP1, Oct. 2020, pp. e76-e84, doi:10.15586/jptcp.v27iSP1.757.