N. Phani Kumar, and K. Sivareddy. “Mathematical Study of SEIR Model With Functional Rates of Incidence and Treatment”. Malaya Journal of Matematik 8, no. 04 (October 1, 2020): 1953–1960. Accessed July 16, 2024. https://www.malayajournal.org/index.php/mjm/article/view/1808.