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 * :scroll: [Parallel Generational-Copying Garbage Collection with a Block-Structured Heap](../garbage_collection/parallel_generational_copying_garbage_collection_with_a_block_structured_heap.pdf). In Haskell, data immutability forces us to produce a lot of temporary data but also helps to collect this garbage rapidly. This paper explains how the Glasgow Haskell Compiler accomplishes this task in a simple, yet effective, manner with no programmer intervention.
 * [Notions of Computation and Monads](https://ac.els-cdn.com/0890540191900524/1-s2.0-0890540191900524-main.pdf?_tid=45497e1c-b5c9-11e7-963f-00000aacb361&acdnat=1508526351_2f3bf288ce0f81ff89fb10ece92eeb9e) by Eugenio Moggi. One of the canonical references for Monads in the functional paradigm. It relates the semantics of computations to equivalences of programs for various notions of computations.
 * [The Essence of Functional Programming](https://page.mi.fu-berlin.de/scravy/realworldhaskell/materialien/the-essence-of-functional-programming.pdf) by Philip Wadler. This paper uses monads to structure functional programs in Haskell. A very good reference for understanding monads and more generally in the context of programming languages.
-* [Monad Transformers and Modular Interpreters](http://haskell.cs.yale.edu/wp-content/uploads/2011/02/POPL96-Modular-interpreters.pdf) by Sheng Liang, Paul Hudak and Mark Jones. Canonical paper on Monad Transformers: the canonical way in which to combine monads and the basis of the popular mtl Haskel library. 
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+* [Monad Transformers and Modular Interpreters](http://haskell.cs.yale.edu/wp-content/uploads/2011/02/POPL96-Modular-interpreters.pdf) by Sheng Liang, Paul Hudak and Mark Jones. Canonical paper on Monad Transformers: the canonical way in which to combine monads and the basis of the popular mtl Haskel library.
+* [Data types a la carte](http://www.cs.ru.nl/~W.Swierstra/Publications/DataTypesALaCarte.pdf) by Wouter Swierstra. Popular paper on using smart constructors and injection operators in order to solve Wadler's expression problem. Also a canonical method of developing algebraic effects by using effect Functors, see Wu, Shrijvers and Hinze(below).
+* [Effect Handlers in Scope](http://www.cs.ox.ac.uk/people/nicolas.wu/papers/Scope.pdf) by Nicolas Wu, Tom Shijvers and Ralf Hinze. Very interesting paper on developing algebraic effects, and handlers a la carte. Extends Swierstra's work by introducing higher order syntax to handle the interaction of effects (such as state and exceptions where errors backtrack the state). 
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