PALAZUELOS, E. Oligopolistics models in oil industry: The «Seven Sisters» versus OPEP. Revista de Historia Industrial — Industrial History Review, [S. l.], v. 21, n. 48, p. 119–153, 2017. Disponível em: https://revistes.ub.edu/index.php/HistoriaIndustrial/article/view/20851. Acesso em: 13 feb. 2025.