@Unpublished{BRS97,
  author = 	 { Mike Burmester and Ronald L. Rivest and Adi Shamir },
  title = 	 { Geometric Cryptography: Identification by Angle Trisection },
  note = 	 { Unpublished draft. },
  OPTyear = 	 { 1997 },
  OPTmonth = 	 { November 4, },
  date =         { 1997-11-04 },                  
}