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Wenger, Oliver S.; Wickleder, Claudia; Krämer, Karl; Güdel, Hans-Ulrich (2001). Upconversion in a divalent rare earth ion: optical absorption and luminescence spectroscopy of Tm2+ doped SrCl2. Journal of luminescence, 94-95, pp. 101-105. North-Holland 10.1016/S0022-2313(01)00255-1
