@book{152153,
	author = {Petschek, Peter. and Walker, Peter, and Hochschule f�ur Technik Rapperswil.},
	title = {Grading :},
	publisher = {Birkh�auser,},
	year = {[2014]},
	address = {Basel :},
	edition = {Second edition, revised and expanded.},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=11006103}
}