Catharine Roth (added cross-reference and keyword, set status) on 30 September 2009@16:12:41. David Whitehead (augmented note; tweaks) on 1 October 2009@04:25:21. David Whitehead (another x-ref) on 26 August 2010@03:01:33. David Whitehead on 14 August 2011@05:43:59. David Whitehead on 12 January 2014@07:07:07.