Sagara, A., Mitarai, O., Tanaka, T., Imagawa, S., Kozaki, Y., Kobayashi, M., et al. (2008). Optimization activities on design studies of LHD-type reactor FFHR. Fusion Engineering and Design, 83(10-12), 1690-1695. doi:10.1016/j.fusengdes.2008.07.029.