SKARAKIS, A.; DAGOUMAS, A. An Optimization Model of the European Natural Gas System. International Journal of Energy Economics and Policy, [S. l.], v. 7, n. 6, p. 48–60, 2017. Disponível em: https://www.econjournals.com/index.php/ijeep/article/view/5649. Acesso em: 13 apr. 2024.