GARCIA-VERDUGO, J.; CONSUEGRA, M. S. Estimating functional efficiency in energy futures markets. Economics and Business Letters, [S. l.], v. 2, n. 3, p. 105–115, 2013. DOI: 10.17811/ebl.2.3.2013.105-115. Disponível em: https://reunido.uniovi.es/index.php/EBL/article/view/10050. Acesso em: 30 apr. 2024.