Yakovenko, Y. V., Weller, A., Werner, A., Zegenhagen, S., Fesenyuk, O. P., & Kolesnichenko, Y. I. (2007). Poloidal trapping of the high-frequency Alfvén continuum and eigenmodes in stellarators. Plasma Physics and Controlled Fusion, 49, 535-558. Retrieved from http://dx.doi.org/10.1088/0741-3335/49/4/015.