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V.G. Prokhorov, Yu.M. Nikolaenko, G.G. Levtchenko, V.L. Svetchnikov, Y.P. Lee, J.S. Park, T.W. Eom, J.M. Kim, G.G. Kaminsky, and V.A. Khokhlov, Evidence for non-Dzyaloshinskii-Moriya ferromagnetism in epitaxial BiFeO3 films, Low Temp. Phys. 37, (2010) [Fiz. Nizk. Temp. 37, 161-166, (2010)] DOI: https://doi.org/10.1063/1.3555838.