@book{227021,
	author = {Griliches, Zvi, and National Bureau of Economic Research.},
	title = {R & D, patents, and productivity},
	publisher = {University of Chicago Press,},
	year = {c1984.},
	series = {National Bureau of Economic Research conference report},
	address = {Chicago :},
	note = {Papers presented at a conference held in Lenox, Mass. in the fall of 1981, and organized by the National Bureau of Economic Research.},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10210019}
}