@conference{GrLS05,
	author = {Stephan Groß and Sabine Lein and Sandra Steinbrecher},
	title = {A Multilateral Secure Payment System for Wireless LAN Hotspots},
	year = {2005},
	series = {LNCS},
	pages = {80-89},
	address = {Copenhagen, DK},
	month = {8}
}