From the Wikipedia topic and topic talk page. (Same link as you provided)
This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. (October 2010)
>"Article quality and sources[edit]This is pretty much an "article from ignorance" now, or perhaps "article by diversion" for it zig-zags between various (often less than logical) examples. And of course, it is mostly source free. John Locke who coined the term is mentioned in passing at the end, but the article is in need of serious clean up. A lot of it seems to have been written by user Agenzen who stopped editing 2 years ago. I seem to have left him a message 2 years ago with a pointer to negation as failure, now that I have looked, but that point is not discussed in the article except in see also. In any case, the best way would be to have a shorter, referenced and to the point definition with a couple of well known examples, instead of of the logical jambalaya that exists now.(talk) 10:53, 17 March 2013 (UTC)"<
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