COVID-19 and dengue co-infection in Brazil: optimal control and cost-effectiveness analysisA. Omame, H. Rwezaura, M. L. Diagne, S. C. Inyama and J. M. TchuencheEur. Phys. J. Plus, 136 10 (2021) 1090DOI: https://doi.org/10.1140/epjp/s13360-021-02030-6