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 * :scroll: [Making a Fast Curry: Push/Enter vs. Eval/Apply for Higher-order Languages](making-a-fast-curry-push-enter-versus-eval-apply-for-higher-order-languages.pdf) by Simon Marlow and Simon Peyton Jones. A classic... describes well the execution model GHC uses for Haskell, and catches the brilliant authors in a design pivot from original intuition to new conclusions based on empirical data.
 * :scroll: [A Poor Man's Concurrency Monad](a-poor-mans-concurrency-monad.pdf) by Koen Claessen. Paper describes how without adding any primitives to the language, you could define a concurrency monad transformer in Haskell.
 * :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. 
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