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Maria Pires, Ana; Heer, Stephan; Ulrich Güdel, Hans; Osvaldo, Antonio Serra (2006). Er, Yb Doped Yttrium Based Nanosized Phosphors: Particle Size, "Host Lattice" and Doping Ion Concentration Effects on Upconversion Efficiency. Journal of fluorescence, 16(3), pp. 461-468. New York, N.Y.: Plenum Publ. 10.1007/s10895-006-0085-9
