@book{35050,
	author = {Kaastra, Jelle. and SpringerLink (Online service)},
	title = {Clusters of Galaxies},
	publisher = {Springer New York,},
	year = {2008.},
	address = {New York, NY :},
	url = {http://dx.doi.org/10.1007/978-0-387-78875-3}
}