Evidence for Griffiths phase in multiferroic BiMnO3 and BiFe0.5Mn0.5O3 films - V. G. Prokhorov; G. G. Kaminsky; J. M. Kim; Y. J. Yoo; Y. P. Lee; V. L. Svetchnikov; G. G. Levchenko; Yu. M. Nikolaenko; V. A. Khokhlov (Low Temperature Physics, 2012)