As Med, A., Syaripuddin, Dadan Hamdani, and Resky Rusnanda. “Stability Analysis of Mathematical Model of Spread of Covid19 SEIRS Type With Constant Birth Rate”. Jurnal Inotera, Vol. 8, no. 1, Apr. 2023, pp. 162-71, doi:10.31572/inotera.Vol8.Iss1.2023.ID229.