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the puzzle of the indo-european origins".
the puzzle of the indo-european origins".
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للاطلاع على المزيد من مناقشة الإطار وتقييمه، انظر anderson j. e. and e. wincoop, “gravity in gravitas: a solution to the border puzzle”, american economic review, 93, 2003. pp.
for an extensive discussion and assessment of the framework, see anderson j. e. and e. wincoop, “gravity in gravitas: a solution to the border puzzle”, american economic review, 93, 2003. pp. 170-92.