@book{21448,
	author = {Hodge, P. },
	title = {The Spiral Galaxy M33},
	publisher = {Springer Netherlands},
	year = {2012},
	series = {Astrophysics and Space Science Library},
	address = {Dordrecht},
	url = {http://doi.org/10.1007/978-94-007-2025-1}
}