1. 1) for example, C.R. Robins: “Chemical and Physical Behavior of Human Hair” 3rd edition (Springer-Verlag, New York, Berlin, Heidelberg, 1994)
2. 2) S. Nagase, S. Shibuichi, K. Ando, E. Kariya and N. Satoh: J. Cosmet. Sci. 53, 89 (2002).
3. 3) S. Nagase, N. Satoh and K. Nakamura: J. Cosmet. Sci. 53, 387 (2002).
4. 4) S. Watanabe, H. Satoh, S. Shibuichi, M. Okamoto, S. Inoue, T. Matsui and N. Satoh: to be submitted.
5. 5) D.A. G Bruggeman: Ann. Phys. (Leipzig) 24, 636 (1935).