@book{21189,
	author = {Avram, Nicolae M.  and Brik, Mikhail G. },
	title = {Optical Properties of 3d-Ions in Crystals},
	publisher = {Springer Berlin Heidelberg},
	year = {2013},
	address = {Heidelberg, Berlin},
	url = {http://doi.org/10.1007/978-3-642-30838-3}
}