@unpublished{Riv99b,
  author = 	 { Ronald L. Rivest },
  title = 	 { Description of the {LCS35} Time Capsule Crypto-Puzzle },
  date =         { 1999-04 },                  
  note = 	 { Unpublished note. },
  eventtitle =   { LCS35 },                  
  eventdate =    { 1999-04-12/1999-04-14 },                  
  venue =        { Cambridge, MA },                  
  urla =         { <a href="#RSW96">related-paper:RSW96</a> },
  urlb =         { <a href="http://www.bricklin.com/albums/lcs35/">Dan-Bricklin's-LCS35-page</a> },                  
  OPTmonth = 	 { April 4, },
  OPTyear = 	 { 1999 },
}