@book{56608,
	author = {Hansen, Thomas},
	title = {Trilobites of the Middle Ordovician Elnes Formation of the Oslo region, Norway /},
	publisher = {Wiley-Blackwell,},
	year = {c2009},
	series = {Fossils and strata,},
	address = {Chichester, West Sussex, UK :},
	note = {"March 2009"--Cover}
}