(1) S. Yokoyama and N. Vasa: “Study on Lightning Damage of Wind Turbine Blades and Protection Method of them”, The Papers of Joint Technical Meeting on Electrical Discharge and High Voltage and Switching, IEE Japan, ED-02-56, HV-02-40, pp. 31-36 (2002) (in Japanese)
横山 茂·Nilesh Vasa:「風車ブレード雷害の問題点と対策の方向性」, 電気学会放電·高電圧合同研資, ED-02-56, HV-02-40, pp. 31-36 (2002)
(2) S. Yokoyama: “Lightning Damage of Wind Turbine Blades and Protection Method of them”, IEEJ Trans, PE, Vol. 124, No. 2, pp. 177-180 (2004-2) (in Japanese)
横山 茂:「風車ブレードの雷害問題」, 電学論B, 124, 2, PP. 177-180 (2004-2)
(3) Y. Shiraishi, T. Otska, and H. Matsuura: “The Observation of the Direct Lightning Stroke in the Wind-Turbine-Generator-System”, Proc. of the 14<sup>th</sup> Annual Conference of Power & Energy Society IEE Japan, Vol. B, No380, pp. 429-430 (2003) (in Japanese)