Martins Junior, D. F., R. D. M. Felzemburg, A. B. Dias, T. M. Costa, and P. N. P. Santos. “Trends in Mortality from Ill-Defined Causes Among the Elderly in Brazil, 1979-2013: Ecological Study”. São Paulo Medical Journal, vol. 134, no. 5, Oct. 2016, pp. 437-45, https://periodicosapm.emnuvens.com.br/spmj/article/view/1147.