@book{4597,
	author = {Zeng, Douglas Zhihua. and World Bank.},
	title = {Knowledge, technology, and cluster-based growth in Africa /},
	publisher = {World Bank,},
	year = {c2008.},
	address = {Washington, DC :},
	url = {http://www.loc.gov/catdir/toc/ecip0724/2007032183.html}
}