De Avila Arroyo, Jomar Patricia, Milton Yago, Muhammad Ali Nasir, and Junjie Wu. “Strategic Alliance in Energy Sector & Implications for Economic Growth and Technical Efficiency: The Case of Petrobras and Galp”. International Journal of Energy Economics and Policy 4, no. 4 (October 15, 2014): 759–771. Accessed December 23, 2024. https://mail.econjournals.com/index.php/ijeep/article/view/953.