@book{68729,
	author = {Merkle, D. and Schrader, B.},
	title = {Hydraulics :},
	publisher = {Festo Didactic GmbH,},
	year = {1998},
	series = {Learning system for automation},
	address = {Denkendorf :},
	note = {Basic level TP 501 : textbook}
}