@book{1611,
	author = {Heijungs, Reinout.},
	title = {Environmental life cycle assessment of products /},
	publisher = {Centre of Environmental Science,},
	year = {c1992.},
	address = {Leiden :},
	note = {"The report consists of two related parts, the Guide and the Backgrounds document, which are only available as a set"--Guide, t.p. verso.}
}