Analysis of Optimal Control in an Age–Structured Epidemic Model with Spatial Diffusion. International Journal of Scientific Research in Science and Technology, [S. l.], v. 12, n. 5, p. 543–554, 2025. DOI: 10.32628/IJSRST25126258. Disponível em: https://www.ijsrst.technoscienceacademy.com/index.php/home/article/view/IJSRST25126258. Acesso em: 30 oct. 2025.