@book{21168,
	author = {Lena, Pierre  and  Didier Pelat},
	title = {Observational Astrophysics},
	publisher = {Springer Berlin Heidelberg},
	year = {2012},
	series = {Astronomy and Astrophysics Library},
	address = {Heidelberg, Berlin},
	url = {http://doi.org/10.1007/978-3-642-21815-6}
}