Phonon excitations and magnetoelectric coupling in multiferroic RMn2O5 Safa Golrokh Bahoosh, Julia M. Wesselinowa and Steffen Trimper Eur. Phys. J. B, 86 5 (2013) 201 Published online: 02 May 2013 DOI: 10.1140/epjb/e2013-40071-x