EXAFS study of cation reordering in 'Na''YF IND. 4':'Yb POT. 3+','Tb POT. 3+' up-conversion luminescence materials - Brito, Hermi Felinto de; Hölsa, Jorma; Laamanen, Taneli; Laihinen, Tero; Lastusaari, Mika; Pihlgren, L; Rodrigues, Lucas Carvalho Veloso; Soukka, Y (Journal of Rare Earths, 2014)