Finally tagless observable recursion for an abstract grammar model. Devriese, D. & Piessens, F. J. Funct. Program., 22(6):757–796, 2012.
bibtex   
@article{DBLP:journals/jfp/DevrieseP12,
  author    = {Dominique Devriese and
               Frank Piessens},
  title     = {Finally tagless observable recursion for an abstract grammar model},
  journal   = {J. Funct. Program.},
  volume    = {22},
  number    = {6},
  pages     = {757--796},
  year      = {2012}
}

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