1. Optical Absorption Lines of Ruby in a Strong Magnetic Field
2. [2] P.G. Russel, D.S. McClure and J.W. Stout, Phys. Rev. Lett. 16 (1966) 176.
3. Resonant Polaron Coupling and Excitons in TlBr under Magnetic Fields
4. [4] Y. Nakagawa, K. Noto, A. Hoshi, S. Miura, K. Watanabe and G. Kido, Proc. Inter. Conf. Magnet Technology (Zurich, 1985) p.458.
5. [5] Y. Muto, Y. Nakagawa, K. Noto, S. Miura, A. Hoshi, K. watanabe, G. Kido, H. Ishikawa, T. Fujioka, Y. Sato, O. Osaki and H. Takano, Sci. Rep. RITU, 33 (1986) 221.