== Copyright problem == 
  This article has been tagged as part of a large-scale clean-up project of multiple article copyright infringement. (See the investigation subpage) It will likely be deleted after one week unless it can be verified to be free of infringement. For legal reasons, Wikipedia cannot accept copyrighted text or images borrowed from other web sites or printed material; such additions must be deleted. Major contributions by contributors who have been verified to have violated copyright in multiple articles may be presumptively deleted in accordance with Wikipedia:Copyright violations.  

 Interested contributors are invited to help clarify the copyright status of this material or rewrite the article in original language at the temporary page linked from the article's face. Please see our guideline on non-free text for how to properly implement limited quotations of copyrighted text.