FURIO, D.; POBLACION, J. Electricity and Natural Gas Prices Sharing the Long-term Trend: Some Evidence from the Spanish Market. International Journal of Energy Economics and Policy, [S. l.], v. 8, n. 5, p. 173–180, 2018. Disponível em: https://econjournals.com/index.php/ijeep/article/view/6854. Acesso em: 28 mar. 2024.