@book{28341,
	author = {Westergȧrd, Anton Hilmar,},
	title = {Non-Agnostidean trilobites of the Middle Cambrian of Sweden.},
	publisher = {Norstedt,},
	year = {1948-53.},
	series = {Sveriges geologiska undersökning. Ser. C. Avhandlingar och uppsatser,},
	address = {Stockholm,}
}