Izzati N, Yannuansa N, Ummah I, Wati DAR, Indahwati E, Purwasih SM, et al. Dynamical analysis of a mathematical model on the spread of diphtheria disease with vaccination completeness factors. Factor M [Internet]. 2024 Dec. 31 [cited 2026 Sep. 7];7(2):206-23. Available from: https://jurnalfaktarbiyah.iainkediri.ac.id/index.php/factorm/article/view/env7n2_p206-223