1. Arakawa, H., Photocatalytic Technology for Direct Water Splitting, CMC Technical library, CMC Publishing Co., Ltd,. (2003) (in Japanese).
2. Fujishima, A., Honda, K., Electrochemical photolysis of water at a semiconductor electrode, Nature, Vol. 238 (1972), p. 37.
3. Fujishima, A., Nakata, K., Ochiai, T., Manivannan, A., Tryk, D. A., Recent Aspects of Photocatalytic Technologies for Solar Fuels, Self-Cleaning, and Environmental Cleanup, The Electrochemical Society Interface - Summer 2013, (2013), pp. 51-56.
4. Miyauchi. M., Irie, H., Liu, M., Qiu, X., Yu, H., Sunada, K., Hashimoto, K., Visible-Light-Sensitive Photocatalysts: Nanocluster-Grafted Titanium Dioxide for Indoor Environmental Remediation, J. Phys. Chem. Lett., Vol. 7, No. 1 (2016), pp. 75-84.
5. Takahashi, T., <https://www.jstage.jst.go.jp/article/seisankenkyu/66/5/66_441/_pdf>, (accessed on 27 May, 2017) (in Japanese).