1. 1) M. Kotani, Y. Uchikawa, Y. Nakaya, H. Mori, S. Kuriki, Measurements of Biomagnetism (in Japanese) p. 13 (CORONA Publishing, Tokyo, 1995).
2. Detection of the magnetic field of the heart
3. 3) P2006-296829A.
4. Feasibility of an intra-cardiac magnetic probe
5. 5) Y. Murayama, T. Ozawa, S. Yabukami, K. Ishiyama, and K.I. Arai:, J. Magn. Soc. Jpn, 31, 17 (2007).