Oliveira, Nilton Marques de. “Aggragate Agricultural Production: An Application to the State of Tocantins”. DESAFIOS - Revista Interdisciplinar da Universidade Federal do Tocantins 5, no. 1 (March 31, 2018): 135–147. Accessed April 10, 2025. https://sistemas.uft.edu.br/periodicos/index.php/desafios/article/view/3963.