E. B. Akponana, E. O. Arierhie, N. J. Egbune, and A. M. Okedoye, “Mathematical Modelling of Diphtheria Transmission Dynamics for Effective Strategies of Prevention and Control with Emphasis on Vaccination and Vaccine-Induced Immunity”, IJRIS, vol. 1, no. 4, pp. 5–14, Dec. 2023, doi: 10.5281/zenodo.11046780.