Marcin Gomulkiewicz Marek Klonowski Miroslaw Kutylowski Rapid Mixing and Security of Chaum's Visual Electronic Voting. 132-145 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2808&spage=132 2003 conf/esorics/2003 ESORICS db/conf/esorics/esorics2003.html#GomulkiewiczKK03