@Misc{Riv09d,
  author = 	 { Ronald L. Rivest },
  title = 	 { Security of Voting Systems },
  howpublished = { Talk given at George Washington University Computer Science Department
                   on November 9, 2009. },
  date =         { 2009-11-09 },                  
  OPTyear = 	 { 2009 },
  OPTmonth = 	 { November 9, },
}