@book{220889,
	author = {Liu, Alex X. and ebrary, Inc.},
	title = {Firewall design and analysis},
	publisher = {World Scientific,},
	year = {2011.},
	series = {Computer and network security ;},
	address = {Hackensack, N.J. :},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10480222}
}