Prokhorov, V.; Nikolaenko, Y.; Levtchenko, G.; Svetchnikov, V.; Lee, Y.; Park, J.; Eom, T.; Kim, J.; Kaminsky, G.; Khokhlov, V. Evidence for Non-Dzyaloshinskii-Moriya Ferromagnetism in Epitaxial BiFeO₃ Films. Fiz. Nizk. Temp. 2010, 37, 161-166.