1. Grätzel M 1996 paper presented at the IPS-11 conference, 28 July–2 August, 1996, Bangalore, India, and personal communication
2. For example, Nelson R CJ. Opt. Soc. Am. 48 (1958);
3. J. Phys. Chem. (1967)71 2517; West W and Gilman P B 1977 in the Theory of the Photographic Process, 4-Edition, Ed. T H James, MacMillan, New York and references therein
4. For example, Steketee J W and de Jonge J 1963 Proc. Koninkl. Ned. Akad. Wetenschap. B66 76; Gerischer H, Michel-Beyerle M E, Rebentrost F and Tributsch H 1968Electrochimica Acta 13 1509
5. The Theory of the Photographic Process, 1977, 4-Edition, Ed. T H James, MacMillan, New York