M. Ameen Pirdawood, H. Mohammed Rasool, Y. Abid Sabawi, and B. Faris Azeez, “Mathematical Modeling and Analysis for COVID-19 Model by Using Implicit-Explicit Rung-Kutta Methods”, ACAD J NAWROZ UNIV, vol. 11, no. 3, pp. 65–73, Jun. 2022.