Mustapha, Umar Tasiu, Yau Umar Ahmad, Abdullahi Yusuf, Sania Qureshi, and Salihu Sabiu Musa. 2023. “Transmission Dynamics of an Age-Structured Hepatitis-B Infection With Differential Infectivity”. Bulletin of Biomathematics 1 (2):124-52. https://doi.org/10.59292/bulletinbiomath.2023007.