HASANTASH, G. H.; MOSTAFAEI, H.; KORDNOORI, S. Modelling the Errors of EIA’s Oil Prices and Production Forecasts by the Grey Markov Model. International Journal of Economics and Financial Issues, [S. l.], v. 2, n. 3, p. 312–319, 2012. Disponível em: https://econjournals.com/index.php/ijefi/article/view/212. Acesso em: 6 may. 2024.