@book{75968,
	author = {Mullaney, James,},
	title = {Double and multiple stars and how to observe them /},
	publisher = {Springer,},
	year = {[2005]},
	series = {Astronomers' observing guides},
	address = {New York :},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10930076}
}