Martins-Filho, P. R., R. R. Rocha Santana, V. S. Santos, and L. G. Barberia. “Poorer and More Densely Populated Regions Have Lower Vaccination Capability Against COVID-19”. EXCLI Journal, vol. 21, Mar. 2022, pp. 621-2, doi:10.17179/excli2022-4798.