@book{21082,
	author = {Grego, Peter },
	title = {Mars and How to Observe It},
	publisher = {Springer New York},
	year = {2012},
	series = {Astronomers' Observing Guides},
	address = {New York},
	url = {http://doi.org/10.1007/978-1-4614-2302-7}
}