Valence Stability and Change of Eu(II)in Oxides
Liu Ying-Liang, Feng De-Xiong, Yang Pei-Hui, Shi Chun-Shan
Acta Phys. -Chim. Sin. . 1999, (05): 426 -430 .  DOI: 10.3866/PKU.WHXB19990508