@book{34676,
	author = {Gilkey, Peter B. and ebrary, Inc.},
	title = {Geometric properties of natural operators defined by the Riemann curvature tensor},
	publisher = {World Scientific,},
	year = {c2001.},
	address = {River Edge, NJ :},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10255766}
}