If you create an Article at your WordPress Blog, using text from Wikipedia you must acknowledge the authorship of the original article and provide a link back to the original wikipedia page.
An example notice, for an article that uses the Wikipedia article
Metasyntactic variable under CC-BY-SA, might read as follows:
This article uses material from the Wikipedia article <a href="http://en.wikipedia.org/wiki/Metasyntactic_variable"> "Metasyntactic_variable"</a>, which is released under the <a href="http://creativecommons.org/licenses/by-sa/3.0/"> Creative Commons Attribution-Share-Alike License 3.0</a>.
Is there a plugin doing this or do i have to create this Example notice myself for every post on my site where i used text excerpts from Wikipedia?