@Misc{Riv04b,
  author = 	 { Ronald L. Rivest },
  title = 	 { Electronic Voting },
  date =         { 2004-06-03 },                  
  howpublished = { Talk given at the NSA June 3, 2004. },
  OPTyear = 	 { 2004 },
  OPTmonth = 	 { June 3, },
}