@book{60425,
	author = {Melark, Peter G. and ebrary, Inc.},
	title = {Comets},
	publisher = {Nova Science Publishers,},
	year = {c2012.},
	series = {Space science, exploration and policies},
	address = {Hauppauge, N.Y. :},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10681243}
}