Curex, N., Toaha, S., & Kasbawati. (2022). Stability Analysis of the Development Mathematical Models for the Spread of Covid-19 Effects of Vaccination and Campaigns as Processes in Controlling the Spread of Disease. Proximal: Jurnal Penelitian Matematika Dan Pendidikan Matematika, 5(2), 50–66. https://doi.org/10.30605/proximal.v5i2.1819