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van der Kolk, E.; Ten Kate, O. M.; Wiegman, J. W.; Biner, D.; Kraemer, K. W. (2011). Enhanced (1)G(4) emission in NaLaF4: Pr3+, Yb3+ and charge transfer in NaLaF4: Ce3+, Yb3+ studied by fourier transform luminescence spectroscopy. Optical materials, 33(7), pp. 1024-1027. Amsterdam: North-Holland 10.1016/j.optmat.2010.08.010
