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Krämer, Karl; Biner, Daniel; Frei, Gabriela Claudia; Güdel, Hans-Ulrich; Hehlen, Markus P.; Lüthi, Stefan R. (2004). Hexagonal Sodium Yttrium Fluoride Based Green and Blue Emitting Upconversion Phosphors. Chemistry of materials, 16(7), pp. 1244-1251. American Chemical Society 10.1021/cm031124o
