Mamo TT, Mekonnen TT. An Age Structure Mathematical Model Analysis on the Dynamics of Chronic and Hyper Toxic Forms of Hepatitis B Virus by SVEA_1 A_2 CR Model with Vaccination Intervention Control Strategy in Ethiopia. IJSBAR. 2020;50(1):106-136. Accessed February 9, 2026. https://www.gssrr.org/JournalOfBasicAndApplied/article/view/10714