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@@ -241,7 +241,10 @@ in M. Broy, editor, *Marktoberdorf Summer School on Program Design Calculi*, Spr
 *	[Continuations for Curmudgeons](http://www.intertwingly.net/blog/2005/04/13/Continuations-for-Curmudgeons) [Commentary](http://lambda-the-ultimate.org/node/643)
 *	[Haskell wiki on Continuations](http://www.haskell.org/haskellwiki/Continuation)
 *	[Haskell wikibook on Continuation Passing Style](http://en.wikibooks.org/wiki/Haskell/Continuation_passing_style)<p>
+
 *	[[!wikipedia Delimited continuation]]
+*	Ken's paper [Shift to Control](http://repository.readscheme.org/ftp/papers/sw2004/shan.pdf), comparing some of the different delimited continuation operators
+*	Racket's documents on [the variety of continuation operators](http://docs.racket-lang.org/reference/cont.html?q=abort#%28mod-path._racket%2Fcontrol%29)
 *	[Composable Continuations Tutorial](http://community.schemewiki.org/?composable-continuations-tutorial) at SchemeWiki
 *	[Post by Ken](http://lambda-the-ultimate.org/node/1197#comment-12927) on Lambda the Ultimate explaining difference between undelimited and delimited continuations
 *	[shift, reset and streams](http://chneukirchen.org/blog/archive/2005/04/shift-reset-and-streams.html)