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\bibitem{Dunne-case} Steve Dunne,
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\bibitem{Harrison} John Harrison: Formalizing Dijkstra. 
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\bibitem{JG} Dean Jacobs and David Gries.
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\bibitem{lhj} Sheng Liang, Paul Hudak, and Mark P Jones.
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\bibitem{Nelson} Greg Nelson. A generalization of Dijkstra's calculus.
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\bibitem{Plotkin} Gordon D. Plotkin.  
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\bibitem{Wadler-essence} Philip Wadler. The Essence of Functional Programming.
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