@book{92455,
	author = {Maidl, Bernhard. and Thewes, Markus.},
	title = {Handbook of tunnel engineering II :},
	publisher = {Ernst & Sohn,},
	year = {2014.},
	address = {Berlin, Germany :},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10833782}
}