William Hutton (augmented note, added link and keyword, set status) on 30 September 2003@17:02:45. David Whitehead (added x-ref) on 1 October 2003@04:13:32. David Whitehead on 3 March 2013@07:20:25. Catharine Roth (upgraded link) on 4 March 2013@20:32:19.