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1منشور في 1968“...British Association for the Advancement of Science. Section F (Economics)...”
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2منشور في 1979“...British Association for the Advancement of Science. Section F (Economics)...”
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3منشور في 1982“...British Association for the Advancement of Science. Section F (Economics)...”
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4منشور في 1981“...British Association for the Advancement of Science. Section F (Economics)...”
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