@book{14940,
	author = {Barrabes, Claude. and Hogan, P. A. and ebrary, Inc.},
	title = {Singular null hypersurfaces in general relativity},
	publisher = {World Scientific,},
	year = {c2003.},
	address = {River Edge, N.J. :},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10255698}
}