@book{128084,
	author = {Griliches, Zvi, and ebrary, Inc.},
	title = {R&D and productivity},
	publisher = {University of Chicago Press,},
	year = {1998.},
	series = {National Bureau of Economic Research monograph},
	address = {Chicago :},
	url = {http://site.ebrary.com/lib/strathmore/Doc?id=10216965}
}