Sat, 28 Feb 2009 17:08:33 +0100 added method "coherent";
wenzelm [Sat, 28 Feb 2009 17:08:33 +0100] rev 30171
added method "coherent"; tuned formal markup;
Sat, 28 Feb 2009 17:08:08 +0100 more refs;
wenzelm [Sat, 28 Feb 2009 17:08:08 +0100] rev 30170
more refs;
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