Structural, morphological and up-converting luminescence characteristics of nanocrystalline Y₂O₃:Yb/Er powders obtained via spray pyrolysis - Lojpur, V.; Mancic, L.; Vulic, P.; Dramicanin, M. D.; Rabanal Jimenez, Maria Eugenia; Milosevic, O. (Ceramics International, 2014)