H. F. AL-Husseiny, A. A. Mohsen, and X. Zhou, “The Effect of Individuals Asymptomatic (Carrier) on The Dynamical Behavior Of a COVID-19 Virus”, IHJPAS, vol. 34, no. 2, pp. 42–55, Apr. 2021, doi: 10.30526/34.2.2624.