@book{42576,
	author = {Ziegler, Gerhard, and Siemens Aktiengesellschaft.},
	title = {Numerical distance protection :},
	publisher = {Publicis Corp. Pub.,},
	year = {2008.},
	address = {Munich :},
	edition = {3rd ed.},
	note = {Includes bibliographical references and index.},
	url = {http://www.loc.gov/catdir/enhancements/fy0902/2008279093-t.html}
}