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Heer, S.; Wermuth, M.; Krämer, Karl; Ehrentraut, D.; Güdel, Hans-Ulrich (2001). Up-conversion excitation of sharp Cr3+ 2E emission in YGG and YAG codoped with Cr3+ and Yb3+. Journal of luminescence, 94-95, pp. 337-341. North-Holland 10.1016/S0022-2313(01)00395-7
