@Unpublished{Riv99c,
  author = 	 { Ronald L. Rivest },
  title = 	 { Some Thoughts on Serial Numbers on {Intel} {CPU}'s },
  note = 	 { Unpublished note, drafted 1/26/99, revised 8/23/99. },
  OPTyear = 	 { 1999 },
  OPTmonth = 	 { January 26, },
  date =         { 1999-01-26 },                  
}