https://api.elsevier.com/content/article/pii/S0960077920306913doi:10.1016/j.chaos.2020.1102951-s2.0-S096007792030691310.1016/j.chaos.2020.110295S0960-0779(20)30691-3Creating and applying SIR modified compartmental model for calculation of COVID-19 lockdown efficiency Chaos, Solitons & FractalsJournal096007792020-12-31December 20201trueFullfalseAuthorhttp://creativecommons.org/licenses/by/4.0/