Drift-sound and drift-Alfvén eigenmodes in toroidal plasmas Ya. I. Kolesnichenko, V. V. Lutsenko, A. Weller, H. Thomsen, Yu. V. Yakovenko, J. Geiger and A. Werner EPL, 85 2 (2009) 25004 Published online: 02 February 2009 DOI: 10.1209/0295-5075/85/25004