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(2) M. Ishii, M. Saito, F. Fujii, M. Matsui, and N. Itamoto: “High-current lightning discharges in winter”, IEEJ Trans. PE, Vol. 128, No. 1, pp. 291-297 (2008-1) (in Japanese)
(3) M. Saito, M. Ishii, F. Fujii, M. Matsui, H. Kawamura, and N. Itamoto: “Evaluation of lightning fault rate of transmission line on the coastal area of the Sea of Japan in winter”, IEEJ Trans. PE, Vol. 129, No. 1, pp. 157-164 (2009-1) (in Japanese)