@online{ wiki:latex,
   author = "Wikipedia",
   title = "{\LaTeX}---Wikipedia{,} The Free Encyclopedia",
   year = "2012",
   url = "http://en.wikipedia.org/wiki/LaTeX",
   urldate = "25.01.2012"
}

@online{ wiki:latex-2,
   author = "Wikipedia",
   title = "{\LaTeX}",
   howpublished = "Wikipedia, The Free Encyclopedia",
   year = "2012",
   eprint ="wiki/LaTeX",
   eprinttype   = {WikiPedia},
   url = "http://en.wikipedia.org/wiki/LaTeX",
   urldate = "25.01.2012"
}
