@book{279,
	author = {Lehnert, Josef.},
	title = {Introduction to telegraph engineering /},
	publisher = {Siemens/Hayden,},
	year = {1977.},
	address = {[S.l.] :},
	edition = {2nd Ed.},
	url = {http://www.amazon.com/exec/obidos/ASIN/0855012331/chopaconline-20}
}