General discussion - Greef, R; Bard, AJ; Blackham, IG; Caffrey, M; Tian, ZW; Fujishima, A; Kruger, J; Denuault, G; Peter, LM; Schultze, JW; Bloor, D; Hugot-Le, Goff A; et al. (Faraday Discussions, 1992)