High-frequency electromagnon in GdMnO3 A. M. Shuvaev, F. Mayr, A. Loidl, A. A. Mukhin and A. Pimenov Eur. Phys. J. B, 80 3 (2011) 351-354 Published online: 14 March 2011 DOI: 10.1140/epjb/e2011-10691-3