title: Correction: unexpected optical activity of cerium in Y2O3:Ce(3+), Yb(3+), Er(3+) up and down-conversion system.
authors: Dipartimento di Scienze Molecolari e Nanosistemi, Università Ca' Foscari di Venezia, Via Torino 155/b, 30170 Mestre, VE, Italy. riellop@unive.it.
authors: Riccardo
authors: R
authors: Marin
authors: Michele
authors: M
authors: Back
authors: Nicolò
authors: N
authors: Mazzucco
authors: Francesco
authors: F
authors: Enrichi
authors: Romana
authors: R
authors: Frattini
authors: Alvise
authors: A
authors: Benedetti
authors: Pietro
authors: P
authors: Riello