@book{14878,
	author = {Ungar, Abraham A. and ebrary, Inc.},
	title = {Analytic hyperbolic geometry and Albert Einstein's special theory of relativity},
	publisher = {World Scientific,},
	year = {c2008.},
	address = {Singapore ;},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10255619}
}