@book{24040,
	author = {Rapp, Donald. and SpringerLink (Online service)},
	title = {Human Missions to Mars},
	publisher = {Praxis Publishing Ltd, Chichester, UK,},
	year = {2007.},
	series = {Springer Praxis Books},
	address = {Berlin, Heidelberg :},
	edition = {1a ed.},
	url = {http://dx.doi.org/10.1007/978-3-540-72939-6}
}