SKARAKIS, Alexios; DAGOUMAS, Athanasios. 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://econjournals.org.tr/index.php/ijeep/article/view/5649. Acesso em: 31 jan. 2025.