V.P. Gnezdilov, K.V. Lamonova, Yu.G. Pashkevich, P. Lemmens, H. Berger, F. Bussy, and S.L. Gnatchenko, Magnetoelectricity in the ferrimagnetic Cu₂OSeO₃:symmetry analysis and Raman scattering study, Low Temp. Phys. 36, (2010) [Fiz. Nizk. Temp. 36, 688-698, (2010)] DOI: https://doi.org/10.1063/1.3455808.