Mathematical Analysis of an Occult Hepatitis B Transmission Model Incorporating Vertical Transmission and Vaccination. International Journal of Development Mathematics (IJDM), [S. l.], v. 3, n. 3, p. 043–064, 2026. DOI: 10.62064/ijdm/0303.03. Disponível em: https://ijdm.org.ng/index.php/Journals/article/view/400.. Acesso em: 9 sep. 2026.