@book{55076,
	author = {Abrahams, John R. and Lollo, Mauro. and ebrary, Inc.},
	title = {Centrex or PBX},
	publisher = {Artech House,},
	year = {c2003.},
	series = {Artech House telecommunications library},
	address = {Boston :},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10081917}
}