@book{227815,
	author = {Andrews, David. and ebrary, Inc.},
	title = {Lumped element quadrature hybrids},
	publisher = {Artech House,},
	year = {c2006.},
	series = {Artech House microwave library},
	address = {Boston :},
	url = {http://site.ebrary.com/lib/strathmore/Doc?id=10160962}
}