@Misc{Riv11f,
  author = 	 { Ronald L. Rivest },
  title = 	 { On the contributions of Alan Turing },
  howpublished = { Remarks given March 15, 2011 at the American Academy of Arts and Science, Cambridge, MA, in
                   association with readings from "Breaking the Code".
                 },
  date =         { 2011-03-15 },                  
  OPTmonth = 	 { March 15, },
  OPTyear = 	 { 2011 },
  urla =         { <a href="http://www.amacad.org/binaries/video/streamPlayer.aspx?i=133">remarks-video</a> },
  urlb =         { <a href="http://www.amacad.org/events/breakingCode/code.aspx">event-site</a> },
}