@inbook{MaHe98,
	author = {Rudolf Mathar and Martin Hellebrandt},
	title = "Optimum Mirror-HLR locations to reduce signalling load in cellular radio networks",
	pages = "139-150",
	publisher = "Kluwer",
	series = "Multiaccess, Mobility and Teletraffic, Advances in Wireless Networks",
	editor = "D. Everitt, M. Rumsewicz",
	address = "Boston",
	year = 1998,
	hsb = {RWTH-CONV-223636},
	}