@unpublished{nepls2015,
 author = {J. M. Siskind},
 title = {Nested Queries in Nondeterministic and Probabilistic Programming
          Languages},
 location = {New England Programming Languages and Systems (NEPLS)},
 date = 10,
 month = nov,
 year = 2015,
 url = {http://engineering.purdue.edu/~qobi/tweet-talks/nepls2015-slides.pdf}}