1. E.R. Kielty, E& MJ (March 1998), pp. 38–40.
2. Anon, Cobalt News 98, (2) (1998), pp. 9–10.
3. M.J. Hawkins, in this issue.
4. P. Searle, in this issue.
5. P. Lenoir et al. (Paper presented at the International Cobalt Conference, Brussels, 10–13, November 1981).