1. 22) Shimizu, T., Horie, T., Watanabe, N., Fujii, S., Yamagata, Y., Kondo, T. & Onuma, M. :Proceedings of the IEEE HOLM Conference on Electrical Contacts,(2014),403-406.
2. 23) Kondo, T., Nakata, H., Sekitani, J., Kubota, Y., Hayakawa, K. & Nakamura, T. :Proceedings of the IEEE HOLM Conference on Electrical Contacts,(2014),73-78.
3. 25) Meng, Y-G., Wen, S-G. & Saiki, H. :Wear, 160(1993),163-170.