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https://books.google.com/books?hl=fr&lr=&id=fkBJ0HL34WsC&oi=fnd&pg=PR5&dq=%5B22%5D%09Broadman,+H.+G.+(2007).+Africa%E2%80%99s+silk+road:+China+and+India%E2%80%99s+new+economic+frontier.+Washington
,+DC:+The+World+Bank.&ots=uevAbZyeuK&sig=gFCouXk-NtGr--He4EuCmmdHTXk#v=onepage&q&f=false

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