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  author =       {C.~Wu and X.~Zhang and C.~Urban},

  title =        {{T}he {M}yhill-{N}erode {T}heorem based on {R}egular {E}xpressions},

  booktitle =    {The Archive of Formal Proofs},

  editor =       {G.~Klein and T.~Nipkow and L.~Paulson},

  publisher =    {\url{http://afp.sourceforge.net/devel-entries/Myhill-Nerode.shtml}},

  month =        Aug,

  year =         2011,

  note =         {Formal proof development},

  ISSN =         {2150-914x}

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@PhdThesis{Haftmann09,

  author = 	 {F.~Haftmann},

  title = 	 {{C}ode {G}eneration from {S}pecifications in {H}igher-{O}rder {L}ogic},

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  year = 	 {2009}

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@article{Harper99,

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  author    = {R.~L.~Constable and

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  year      = {2000},

  publisher = {MIT Press},

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@Article{AycHor02,

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