@book{15450,
	author = {Ludvigsen, Rolf,},
	title = {Upper Cambrian and Lower Ordovician Trilobite biostratigraphy of the Rabbitkettle Formation /},
	publisher = {BRILL,},
	year = {1982.},
	series = {Life Sciences, Contributions (ROM) ;},
	address = {Leiden ;},
	url = {http://dx.doi.org/10.1163/9789004628182}
}