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Ian E. A. Yeboah, Samuel N. A. Codjoe, John K. Maingi, Emerging Urban System Demographic Trends: Informing Ghana's National Urban Policy and Lessons for Sub-Saharan Africa, Africa Today, Vol. 60, No. 1 (Fall 2013), pp. 99-124
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Yeboah et al. (2013) studied this question.
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