Mathematical modelling and optimal-control strategies of schistosomiasis–typhoid fever co-infection: using the demographic setting of Makurdi, Benue State, Nigeria. Journal of the Nigerian Society of Physical Sciences, [S. l.], v. 8, n. 3, p. 3376, 2026. DOI: 10.46481/jnsps.2026.3376. Disponível em: https://journal.nsps.org.ng/index.php/jnsps/article/view/3376. Acesso em: 25 jul. 2026.