 @misc{ wikipedia,
   author = "Wikipedia",
   title = "Liouville number --- {W}ikipedia{,} The Free Encyclopedia",
   year = "2015",
   howpublished = "\url{https://en.wikipedia.org/w/index.php?title=Liouville_number&oldid=696910651}",
   note = "[Online; accessed 22-July-2004]"
 }
