Lazo, M. J., and A. De Cezaro. “Why Can We Observe a Plateau Even in an Out of Control Epidemic Outbreak? A SEIR Model With the Interaction of N Distinct Populations for Covid-19 in Brazil”. Trends in Computational and Applied Mathematics, vol. 22, no. 1, Apr. 2021, pp. 109-23, doi:10.5540/tcam.2021.022.01.00109.