1. [1] J.Saito, M.Sato, H.Matsumoto and H.Akasaka: Proc. of Int. Symp. on Optical Memory, Tokyo 1987, Jpn. J. Appl. Phys., vol. 26, Suppl. 26-4, (1987) p.155.
2. [2] K.Aratani, M.Kaneko, Y.Mutoh, K.Watanabe and H.Makino: Proc. of SPIE vol. 1078, Optical Data Storage Topical Meeting, Los Angeles (1989) p.258.
3. [3] A.Nakaoki, Y.Mutoh, S.Tanaka, T.Shimouma, K.Asano, K.Aratani, M.Kaneko and K.Watanabe: Proc. of SPIE vol. 1316, Optical Data Storage Topical Meeting, Vancouver (1990) p.292.
4. [4] S.Tanaka, T.Shimouma, A.Nakaoki, K.Aratani and M.Kaneko: Proc. of Magneto-Optical Recording International Symposium '91, Tokyo (1991) p.331.
5. [5] M.Kaneko, K.Aratani, Y.Mutoh, A.Nakaoki, K.Watanabe and H.Makino: Proc. of Int. Symp. on Optical Memory, Kobe 1989, Jpn. J. Appl. Phys., vol. 28, Suppl. 28-3, (1989) p.27.