SANTOS, Mayronne Joaquim Fonseca dos, et al. “RELATIVE DATA SAMPLING OF HYPSOMETRIC RELATIONSHIP IN THE SAVANNA REGION OF TOCANTINS”. Brazilian Journal of Biometrics, vol. 34, no. 4, Dec. 2016, pp. 633-45, http://www.cienciadainformacaoexpress.ufla.br/index.php/BBJ/article/view/253.