AKPAN*, A. .; THOMAS†, D. . Mathematical modeling of the effect of kidnapping in Nigeria. International Journal of Mathematical Analysis and Modelling, [S. l.], v. 6, n. 2, 2023. Disponível em: https://tnsmb.org/journal/index.php/ijmam/article/view/102. Acesso em: 23 aug. 2026.