1. 1) K. Katayama, T. Ohkura, K. Hashimoto and Y. Yamashita: Kohgaku no tameno Mukizairyokagaku, (Science-sha, Japan, 2006) pp. 166–167.
2. 2) S. Sakka: Sol-Gel hou no Kagaku, (Agune-shoufusha, Japan, 2006) pp. 216–219.
3. 3) D. C. Brandley, R. C. Mehrotra and D. P. Gaur: Metal Alkoxides, (Academic Press, 1978) 5–58.
4. 4) Japanese patent: JP2008121135(A).
5. 5) The Japan Institute of Light Metals Report: Aluminum no Kinouhimaku to sono Ouyou, (The Japan Institute of Light Metals, 1985), pp. 1–9.