Mele, Marco, and Angelo Quarto. “A Gravitational Model for Estimate the Determinants of Outward Foreign Direct Investment of China”. International Journal of Economics and Financial Issues 7, no. 1 (January 13, 2017): 1–5. Accessed August 23, 2025. https://www.econjournals.net.tr/index.php/ijefi/article/view/1663.