(1) K. Ajiki, Y. Hisamizu, and Y. Nagayoshi: “Study on Case Related to Burnt Accident of Gap Arrester in AC Feeding System”, IEEJ Industry Appli. Society Conference 2002, No. 237 (2002-8) (in Japanese)
(4) K. Ajiki, Y. Hisamizu, H. Morimoto, M. Hino, N. Kinoshita, and K. Uchinuma: “Study of Unnecessary Sparking Current of Gap Arrester in AC Feeding System”, IEEJ Industry Appli. Society Conference 2003, No. 3-88 (2003-8) (in Japanese)