rename topics/_coroutines_and_aborts.mdwn to topics/week13_coroutines_exceptions_and_...

[lambda.git] / topics / week9_monad_transformers.mdwn

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@@ -190,7 +190,8 @@ This is fun. Here is a List around a List. Notice the difference it makes whethe
 Further Reading
 ---------------
 
-*      This is excellent, everyone should read: [Monad Transformers Step by Step](http://www.grabmueller.de/martin/www/pub/Transformers.pdf)
+*      This is excellent, everyone should read: [Monad Transformers Step by Step](http://www.cs.virginia.edu/~wh5a/personal/Transformers.pdf)
+<!-- also http://web.archive.org/web/20140711174905/http://www.grabmueller.de/martin/www/pub/Transformers.pdf -->
 
 *      Read Part III of [All About Monads](http://web.archive.org/web/20071106232016/haskell.org/all_about_monads/html/introIII.html). This link is to an archived version, the main link to haskell.org seems to be broken. Some but not all of this site has been [absorbed into the Haskell wikibook](http://en.wikibooks.org/wiki/Haskell/Monad_transformers).