ARTEMKINA, L. R.; SOPILKO, N. Y.; MYASNIKOVA, O. Y.; EREMINA, I. U.; BONDARCHUK, N. V.; SHAMSHEEV, S. V. The Model of Upstream Investment Portfolio in the Mature Regions. International Journal of Energy Economics and Policy, [S. l.], v. 9, n. 4, p. 173–180, 2019. Disponível em: https://econjournals.com/index.php/ijeep/article/view/7965. Acesso em: 20 apr. 2024.