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Rugman, A., & Fratianni, M. (2009-01-15). The Gravity Equation in International Trade. In The Oxford Handbook of International Business. : Oxford University Press. Retrieved 4 Mar. 2021, from https://www.oxfordhandbooks.com/view/10.1093/oxfordhb/9780199234257.001.0001/oxfordhb-9780199234257-e-003.
Rugman, Alan M., and Michele Fratianni. "The Gravity Equation in International Trade." The Oxford Handbook of International Business. : Oxford University Press,
September 02, 2009. Oxford Handbooks Online. Date Accessed 4 Mar. 2021 <https://www.oxfordhandbooks.com/view/10.1093/oxfordhb/9780199234257.001.0001/oxfordhb-9780199234257-e-003>.
Rugman, Alan M., and Michele Fratianni. "The Gravity Equation in International Trade." In The Oxford Handbook of International Business. : Oxford University Press, 2009-01-15. https://www.oxfordhandbooks.com/view/10.1093/oxfordhb/9780199234257.001.0001/oxfordhb-9780199234257-e-003.