Yang, J.C,
Q He,
S.J Suresha,
C.Y Kuo,
C.Y Peng,
R.C Haislmaier,
M.A Motyka,
G Sheng,
C Adamo,
H.J Lin,
Z Hu,
L Chang,
L.H Tjeng,
E Arenholz,
N.J Podraza,
M Bernhagen,
R Uecker,
D.G Schlom,
V Gopalan,
L.Q Chen,
C.T Chen,
Ramamoorthy Ramesh, and
Y.H Chu. "
Orthorhombic BiFeO3."
Physical Review Letters 109 (2012).