| 1 | Tinbergen, J. (1962), Shaping the World Economy; Suggestions for an International Economic Policy. New York: Twentieth Century Fund. |
| 2 | ITC-International Trade Center (2003). A Gravity Model for The Calculation of Trade Potentials for Developing Countries and Economies in Transition. TradeSim (second version), Explanatory Notes |
| 3 | WTO and UNCTAD (2012). A Practical Guide to Trade Policy Analysis. www.wto.org/english/res_e/publications_e/wto_unctad12_e.pdf |
| 4 | Deardorff, Alan V. (1998). Determinants of Bilateral Trade: Does Gravity Work in a Neoclassical World?" In J.A. Frankel, ed., The Regionalization of the World Economy,University of Chicago Press, 7-32. |
| 5 | Eaton, J. and Kortum, S. (2002). Technology, Geography, and Trade. Econometrica, 70(5), 1741-1779. |
| 6 | ITC-(2013). Trade Competitiveness Map. http://legacy.intracen.org/appli1/Trade Com/TPIS.aspx?RP=792&SC=04&YR=2011 |
| 7 | Wall, Howard I. (1999). ?Using the Gravity Model to Estimate the Costs of Protection.? Federal Reserve Bank of St. Louis Review 81:1 (January/February), 33-40 |