Kolesnichenko, Y. I., Lutsenko, V. V., Weller, A., Werner, A., Wobig, H., Yakovenko, Y. V., et al. (2006). Effects of fast-ion-orbit width on Alfvén instabilities in stellarators: a general theory and its application to a W7-AS experiment. Nuclear Fusion, 46, 753-769. Retrieved from http://www.iop.org/EJ/abstract/0029-5515/46/8/001.