The role of Cu codoping on the Fe metal clustering and ferromagnetism in Fe-doped In2O3 films. - Jiang, Feng-Xian; Feng, Qi; Quan, Zhi-Yong; Ma, Rong-Rong; Heald, S.M.; Gehring, G.A.; Xu, Xiao-Hong (Materials Research Bulletin, 2013)