Possible interplay between a two phonon mode and high energy magnetic excitations in BiFeO3 M. Cazayous, A. Sacuto, D. Lebeugle and D. Colson Eur. Phys. J. B, 67 2 (2009) 209-212 Published online: 29 January 2009 DOI: 10.1140/epjb/e2009-00033-7