@book{172507,
	author = {Levitt, M. and ebrary, Inc.},
	title = {Concrete materials},
	publisher = {E & FN Spon,},
	year = {1997.},
	address = {London ;},
	edition = {1st ed.},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10057167}
}