@book{68115,
	author = {Gerhard Pahl, Wolfgang Beitz, Jörg Feldhusen, Karl-Heinrich Grote},
	title = {Engineering Design},
	publisher = {Springer},
	year = {2014},
	address = {Germany},
	url = {http://link.springer.com/book/10.1007/978-1-84628-319-2 }
}