Byoungcheon Lee Colin Boyd Ed Dawson Kwangjo Kim Jeongmo Yang Seungjae Yoo Providing Receipt-Freeness in Mixnet-Based Voting Protocols. 245-258 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2971&spage=245 2003 conf/icisc/2003 ICISC db/conf/icisc/icisc2003.html#LeeBDKYY03