@unpublished{ppaml2014,
 author = {J. M. Siskind},
 title = {Probabilistic Programming: From Principled Foundations, Through
          Efficient Implementation, To Innovative Applications},
 location = {DARPA Probabilistic Programming for Advancing Machine Learning
             (PPAML) Program PI Meeting},
 date = 10,
 month = jul,
 year = 2014,
 url = {http://engineering.purdue.edu/~qobi/tweet-talks/ppaml2014-slides.pdf}}