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)