1.
Cakir Z, Sendur A. A note on epidemiologic models: SIR modeling of the COVID-19 with variable coefficients. M [Internet]. 2022 Mar. 30 [cited 2025 Jul. 3];105(1):43-51. Available from: https://mts.buketov.edu.kz/index.php/mathematics-vestnik/article/view/464