OPTIMAL CONTROL MATHEMATICAL MODEL OF MALARIA AND TYPHOID FEVER CO-INFECTION DYNAMICS WITH ENVIRONMENTAL DEPENDENCY. The Transactions of the Nigerian Association of Mathematical Physics, [S. l.], v. 25, p. 105–123, 2026. DOI: 10.60787/tnamp.v25.735. Disponível em: https://nampjournals.org.ng/index.php/tnamp/article/view/735.. Acesso em: 26 aug. 2026.