PARIS, Q. Cost function and positive mathematical programming. Bio-based and Applied Economics, [S. l.], v. 6, n. 1, p. 19–35, 2017. DOI: 10.13128/BAE-18140. Disponível em: https://oaj.fupress.net/index.php/bae/article/view/3304. Acesso em: 25 apr. 2024.