1. S. Nonomura, H. Hayashi and S. Nitta, (1989) Rev. Sci. Instru. 60: 657
2. S. Nonomura, T. Nishiwaki and S. Nitta, (1993) Phil. Mag., in print.
3. Nitta, S. and Hatano, A., (1984) Technical Digest of the International PVSEC-1: 715
4. Hatano, A. and Nitta, S., (1984) Solid State Physiscs 19: 419 (in Japanese).
5. Itoh, T., Habuchi, H., Nitta, S. and Nonomura, S., (1993) Fullerene Science and Technology, in print.