@book{220990,
	author = {Ungar, Abraham Albert. and ebrary, Inc.},
	title = {Barycentric calculus in Euclidian and hyperbolic geometry},
	publisher = {World Scientific,},
	year = {2010.},
	address = {Hackensack, N.J. :},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10480301}
}