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Suyver, J.F.; Aebischer, A.; Biner, Daniel; Gerner, P.; Grimm, J.; Heer, S.; Krämer, Karl; Reinhard, C.; Güdel, Hans-Ulrich (2005). Novel materials doped with trivalent lanthanides and transition metal ions showing near-infrared to visible photon upconversion. Optical materials, 27(6), pp. 1111-1130. North-Holland 10.1016/j.optmat.2004.10.021
