Amendment to the Multiferroic Landau Model of BiFeO_3
WANG Ying-long,WANG Xing-yuan,DING Xue-cheng,LIANG Wei-hua,DENG Ze-chao,CHU Li-zhi,FU Guang-sheng
Journal of Hebei University (Natural Science Edition) . 2009, (6): 577 -581 .  DOI: 10.3969/j.issn.1000-1565.2009.06.006