R. A. Costa, E. M. Costa, and F. Z. Mariano, “Differentials of income in rural areas of Brazil”, Rev. Polit. Agric., vol. 25, no. 4, pp. 112–135, Apr. 2017, Accessed: Sep. 20, 2026. Available: https://rpa.sede.embrapa.br/RPA/article/view/1207