@book{67513,
	author = {Machin, David, and ebrary, Inc.},
	title = {Sample size tables for clinical studies},
	publisher = {Wiley-Blackwell,},
	year = {2009.},
	address = {Chichester, UK ;},
	edition = {3rd ed.},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10301448}
}