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Hehlen, Markus P.; Brik, Mikhail G.; Krämer, Karl W. (2013). 50th anniversary of the Judd–Ofelt theory: An experimentalist's view of the formalism and its application. Journal of luminescence, 136, pp. 221-239. Amsterdam: North-Holland 10.1016/j.jlumin.2012.10.035
