@book{642,
	author = {Webby, B. D.,},
	title = {The great Ordovician biodiversification event /},
	publisher = {Columbia University Press,},
	year = {2004.},
	series = {Critical Moments and Perspectives in Earth History and Paleobiology},
	address = {New York ;},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10958804}
}