@misc{JP06,
  author	= "Hugo Jonker and Wolter Pieters",
  title		= "Receipt-Freeness as a special case of
  		   Anonymity in Epistemic Logic",
  month		= "June",
  note		= "IAVoSS Workshop On Trustworthy Elections (WOTE2006),
  		   Cambridge",
  year		= "2006"
}