Signed-off-by: Jim Pryor <profjim@jimpryor.net>
[Part 3](http://schemekeys.blogspot.com/2007/01/going-further-with-primitives.html)
[Part 4](http://schemekeys.blogspot.com/2007/01/odd-and-ends.html)
[Part 3](http://schemekeys.blogspot.com/2007/01/going-further-with-primitives.html)
[Part 4](http://schemekeys.blogspot.com/2007/01/odd-and-ends.html)
+* [Delimited continuations in natural language semantics](http://okmij.org/ftp/gengo/)
+